[WebAssembly] Fix CPU tests in wasm-features.c (#80900)

The CPU tests in this file are not working as intended. Specifying
`-mcpu=[mvp|generic|bleeding-edge]` in `clang` command line does NOT add
arguments like `-target-feature`, `+feature-name`, ... to `clang-14`
command line. Specifying `-mcpu=[mvp|generic|bleeding-edge]` in `clang`
command line will just add `-target-cpu` `[mvp|generic|bleeding-edge]`
to `clang-14` command line, and individual features are added here
within `clang-14` invocation:
https://github.com/llvm/llvm-project/blob/5b780c8c6c558ec283a9eec485a4f172df0f9fe1/clang/lib/Basic/Targets/WebAssembly.cpp#L150-L163
                                                                                
The reason these CPU tests are passing is because they only have `-NOT`
checks, and we don't emit `-target-feature` arguments for them anyway,
the test passes, but they don't check what they are supposed to check.

This make CPU tests only check `-target-cpu` lines instead of individual
features, which will not be emitted.

Author: aheejin

clang/test/Driver/wasm-features.c

@@ -2,131 +2,89 @@
 
 // CHECK: "-fvisibility=hidden"
 
-// RUN: %clang --target=wasm32-unknown-unknown -### %s 2>&1 | FileCheck %s -check-prefix=DEFAULT
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mcpu=mvp 2>&1 | FileCheck %s -check-prefix=MVP
+// RUN: %clang --target=wasm32-unknown-unknown -### %s 2>&1 | FileCheck %s -check-prefix=GENERIC
+// RUN: %clang --target=wasm32-unknown-unknown -### %s -mcpu=generic 2>&1 | FileCheck %s -check-prefix=GENERIC
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mcpu=bleeding-edge 2>&1 | FileCheck %s -check-prefix=BLEEDING-EDGE
 
+// MVP: "-target-cpu" "mvp"
+// GENERIC: "-target-cpu" "generic"
+// BLEEDING-EDGE: "-target-cpu" "bleeding-edge"
+
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mbulk-memory 2>&1 | FileCheck %s -check-prefix=BULK-MEMORY
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-bulk-memory 2>&1 | FileCheck %s -check-prefix=NO-BULK-MEMORY
 
 // BULK-MEMORY: "-target-feature" "+bulk-memory"
 // NO-BULK-MEMORY: "-target-feature" "-bulk-memory"
-// DEFAULT-NOT: "-target-feature" "-bulk-memory"
-// MVP-NOT: "-target-feature" "+bulk-memory"
-// BLEEDING-EDGE-NOT: "-target-feature" "-bulk-memory"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mmutable-globals 2>&1 | FileCheck %s -check-prefix=MUTABLE-GLOBALS
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-mutable-globals 2>&1 | FileCheck %s -check-prefix=NO-MUTABLE-GLOBALS
 
 // MUTABLE-GLOBALS: "-target-feature" "+mutable-globals"
 // NO-MUTABLE-GLOBALS: "-target-feature" "-mutable-globals"
-// DEFAULT-NOT: "-target-feature" "-mutable-globals"
-// MVP-NOT: "-target-feature" "+mutable-globals"
-// BLEEDING-EDGE-NOT: "-target-feature" "-mutable-globals"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -msign-ext 2>&1 | FileCheck %s -check-prefix=SIGN-EXT
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-sign-ext 2>&1 | FileCheck %s -check-prefix=NO-SIGN-EXT
 
 // SIGN-EXT: "-target-feature" "+sign-ext"
 // NO-SIGN-EXT: "-target-feature" "-sign-ext"
-// DEFAULT-NOT: "-target-feature" "-sign-ext"
-// MVP-NOT: "-target-feature" "+sign-ext"
-// BLEEDING-EDGE-NOT: "-target-feature" "-sign-ext"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mnontrapping-fptoint 2>&1 | FileCheck %s -check-prefix=NONTRAPPING-FPTOINT
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-nontrapping-fptoint 2>&1 | FileCheck %s -check-prefix=NO-NONTRAPPING-FPTOINT
 
 // NONTRAPPING-FPTOINT: "-target-feature" "+nontrapping-fptoint"
 // NO-NONTRAPPING-FPTOINT: "-target-feature" "-nontrapping-fptoint"
-// DEFAULT-NOT: "-target-feature" "-nontrapping-fptoint"
-// MVP-NOT: "-target-feature" "+nontrapping-fptoint"
-// BLEEDING-EDGE-NOT: "-target-feature" "-nontrapping-fptoint"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mmultivalue 2>&1 | FileCheck %s -check-prefix=MULTIVALUE
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-multivalue 2>&1 | FileCheck %s -check-prefix=NO-MULTIVALUE
 
 // MULTIVALUE: "-target-feature" "+multivalue"
 // NO-MULTIVALUE: "-target-feature" "-multivalue"
-// DEFAULT-NOT: "-target-feature" "-multivalue"
-// MVP-NOT: "-target-feature" "+multivalue"
-// GENERIC-NOT: "-target-feature" "+multivalue"
-// BLEEDING-EDGE-NOT: "-target-feature" "-multivalue"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mmultimemory 2>&1 | FileCheck %s -check-prefix=MULTIMEMORY
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-multimemory 2>&1 | FileCheck %s -check-prefix=NO-MULTIMEMORY
 
 // MULTIMEMORY: "-target-feature" "+multimemory"
 // NO-MULTIMEMORY: "-target-feature" "-multimemory"
-// DEFAULT-NOT: "-target-feature" "-multimemory"
-// MVP-NOT: "-target-feature" "+multimemory"
-// BLEEDING-EDGE-NOT: "-target-feature" "-multimemory"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -matomics 2>&1 | FileCheck %s -check-prefix=ATOMICS
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-atomics 2>&1 | FileCheck %s -check-prefix=NO-ATOMICS
 
 // ATOMICS: "-target-feature" "+atomics"
 // NO-ATOMICS: "-target-feature" "-atomics"
-// DEFAULT-NOT: "-target-feature" "-atomics"
-// MVP-NOT: "-target-feature" "+atomics"
-// GENERIC-NOT: "-target-feature" "+atomics"
-// BLEEDING-EDGE-NOT: "-target-feature" "-atomics"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mtail-call 2>&1 | FileCheck %s -check-prefix=TAIL-CALL
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-tail-call 2>&1 | FileCheck %s -check-prefix=NO-TAIL-CALL
 
 // TAIL-CALL: "-target-feature" "+tail-call"
 // NO-TAIL-CALL: "-target-feature" "-tail-call"
-// DEFAULT-NOT: "-target-feature" "-tail-call"
-// MVP-NOT: "-target-feature" "+tail-call"
-// GENERIC-NOT: "-target-feature" "+tail-call"
-// BLEEDING-EDGE-NOT: "-target-feature" "-tail-call"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mreference-types 2>&1 | FileCheck %s -check-prefix=REFERENCE-TYPES
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-reference-types 2>&1 | FileCheck %s -check-prefix=NO-REFERENCE-TYPES
 
 // REFERENCE-TYPES: "-target-feature" "+reference-types"
 // NO-REFERENCE-TYPES: "-target-feature" "-reference-types"
-// DEFAULT-NOT: "-target-feature" "-reference-types"
-// MVP-NOT: "-target-feature" "+reference-types"
-// GENERIC-NOT: "-target-feature" "+reference-types"
-// BLEEDING-EDGE-NOT: "-target-feature" "-reference-types"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -msimd128 2>&1 | FileCheck %s -check-prefix=SIMD128
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-simd128 2>&1 | FileCheck %s -check-prefix=NO-SIMD128
 
 // SIMD128: "-target-feature" "+simd128"
 // NO-SIMD128: "-target-feature" "-simd128"
-// DEFAULT-NOT: "-target-feature" "-simd128"
-// MVP-NOT: "-target-feature" "+simd128"
-// GENERIC-NOT: "-target-feature" "+simd128"
-// BLEEDING-EDGE-NOT: "-target-feature" "+simd128"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mrelaxed-simd 2>&1 | FileCheck %s -check-prefix=RELAXED-SIMD
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-relaxed-simd 2>&1 | FileCheck %s -check-prefix=NO-RELAXED-SIMD
 
 // RELAXED-SIMD: "-target-feature" "+relaxed-simd"
 // NO-RELAXED-SIMD: "-target-feature" "-relaxed-simd"
-// DEFAULT-NOT: "-target-feature" "-relaxed-simd"
-// MVP-NOT: "-target-feature" "+relaxed-simd"
-// GENERIC-NOT: "-target-feature" "+relaxed-simd"
-// BLEEDING-EDGE-NOT: "-target-feature" "+relaxed-simd"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mexception-handling 2>&1 | FileCheck %s -check-prefix=EXCEPTION-HANDLING
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-exception-handling 2>&1 | FileCheck %s -check-prefix=NO-EXCEPTION-HANDLING
 
 // EXCEPTION-HANDLING: "-target-feature" "+exception-handling"
 // NO-EXCEPTION-HANDLING: "-target-feature" "-exception-handling"
-// DEFAULT-NOT: "-target-feature" "-exception-handling"
-// MVP-NOT: "-target-feature" "+exception-handling"
-// GENERIC-NOT: "-target-feature" "+exception-handling"
-// BLEEDING-EDGE-NOT: "-target-feature" "+exception-handling"
 
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mextended-const 2>&1 | FileCheck %s -check-prefix=EXTENDED-CONST
 // RUN: %clang --target=wasm32-unknown-unknown -### %s -mno-extended-const 2>&1 | FileCheck %s -check-prefix=NO-EXTENDED-CONST
 
 // EXTENDED-CONST: "-target-feature" "+extended-const"
 // NO-EXTENDED-CONST: "-target-feature" "-extended-const"
-// DEFAULT-NOT: "-target-feature" "-extended-const"
-// MVP-NOT: "-target-feature" "+extended-const"
-// GENERIC-NOT: "-target-feature" "+extended-const"
-// BLEEDING-EDGE-NOT: "-target-feature" "+extended-const"