Revert "[WebAssembly] remove instruction after builtin trap" (#90354)

Reverts #90207

LLD Bots are broken.

Author: joker-eph

llvm/lib/Target/WebAssembly/CMakeLists.txt

@@ -19,7 +19,6 @@ add_llvm_target(WebAssemblyCodeGen
   WebAssemblyArgumentMove.cpp
   WebAssemblyAsmPrinter.cpp
   WebAssemblyCFGStackify.cpp
-  WebAssemblyCleanCodeAfterTrap.cpp
   WebAssemblyCFGSort.cpp
   WebAssemblyDebugFixup.cpp
   WebAssemblyDebugValueManager.cpp

llvm/lib/Target/WebAssembly/WebAssembly.h

@@ -37,7 +37,6 @@ FunctionPass *createWebAssemblyISelDag(WebAssemblyTargetMachine &TM,
                                        CodeGenOptLevel OptLevel);
 FunctionPass *createWebAssemblyArgumentMove();
 FunctionPass *createWebAssemblySetP2AlignOperands();
-FunctionPass *createWebAssemblyCleanCodeAfterTrap();
 
 // Late passes.
 FunctionPass *createWebAssemblyReplacePhysRegs();
@@ -64,7 +63,6 @@ void initializeOptimizeReturnedPass(PassRegistry &);
 void initializeWebAssemblyRefTypeMem2LocalPass(PassRegistry &);
 void initializeWebAssemblyAddMissingPrototypesPass(PassRegistry &);
 void initializeWebAssemblyArgumentMovePass(PassRegistry &);
-void initializeWebAssemblyCleanCodeAfterTrapPass(PassRegistry &);
 void initializeWebAssemblyCFGSortPass(PassRegistry &);
 void initializeWebAssemblyCFGStackifyPass(PassRegistry &);
 void initializeWebAssemblyDAGToDAGISelPass(PassRegistry &);

llvm/lib/Target/WebAssembly/WebAssemblyCleanCodeAfterTrap.cpp

@@ -512,10 +512,6 @@ bool WebAssemblyPassConfig::addInstSelector() {
   // Eliminate range checks and add default targets to br_table instructions.
   addPass(createWebAssemblyFixBrTableDefaults());
 
-  // unreachable is terminator, non-terminator instruction after it is not
-  // allowed.
-  addPass(createWebAssemblyCleanCodeAfterTrap());
-
   return false;
 }
 

llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp

@@ -30,6 +30,7 @@ define void @trap_ret_void() {
 ; CHECK:         .functype trap_ret_void () -> ()
 ; CHECK-NEXT:  # %bb.0:
 ; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    # fallthrough-return
 ; CHECK-NEXT:    end_function
   call void @llvm.trap()
   ret void
@@ -53,6 +54,7 @@ define void @trap_unreacheable() {
 ; CHECK:         .functype trap_unreacheable () -> ()
 ; CHECK-NEXT:  # %bb.0:
 ; CHECK-NEXT:    unreachable
+; CHECK-NEXT:    unreachable
 ; CHECK-NEXT:    end_function
   call void @llvm.trap()
   unreachable
@@ -92,12 +94,3 @@ define i32 @missing_ret_noreturn_unreachable() {
   call void @ext_never_return()
   unreachable
 }
-
-define i32 @no_crash_for_other_instruction_after_trap(ptr %p, i32 %b) {
-; CHECK-LABEL: no_crash_for_other_instruction_after_trap:
-; CHECK:      unreachable
-; CHECK-NEXT: end_function
-  %a = load i32, ptr %p
-  call void @llvm.trap()
-  ret i32 %a
-}

llvm/test/CodeGen/WebAssembly/unreachable.ll

@@ -80,29 +80,29 @@ declare void @func3()
 ; CHECK-NEXT:         Offset:          0x1D
 ; CHECK-NEXT:       - Type:            R_WASM_FUNCTION_INDEX_LEB
 ; CHECK-NEXT:         Index:           6
-; CHECK-NEXT:         Offset:          0x2B
+; CHECK-NEXT:         Offset:          0x2C
 ; CHECK-NEXT:       - Type:            R_WASM_TABLE_INDEX_SLEB
 ; CHECK-NEXT:         Index:           5
-; CHECK-NEXT:         Offset:          0x36
+; CHECK-NEXT:         Offset:          0x37
 ; CHECK-NEXT:       - Type:            R_WASM_MEMORY_ADDR_SLEB
 ; CHECK-NEXT:         Index:           3
-; CHECK-NEXT:         Offset:          0x3E
+; CHECK-NEXT:         Offset:          0x3F
 ; CHECK-NEXT:       - Type:            R_WASM_FUNCTION_INDEX_LEB
 ; CHECK-NEXT:         Index:           4
-; CHECK-NEXT:         Offset:          0x44
+; CHECK-NEXT:         Offset:          0x45
 ; CHECK-NEXT:     Functions:
 ; CHECK-NEXT:       - Index:           5
 ; CHECK-NEXT:         Locals:
 ; CHECK-NEXT:         Body:            1080808080000B
 ; CHECK-NEXT:       - Index:           6
 ; CHECK-NEXT:         Locals:
-; CHECK-NEXT:         Body:            02404181808080004100418080808000108180808000450D00000B0B
+; CHECK-NEXT:         Body:            02404181808080004100418080808000108180808000450D0000000B0B
 ; CHECK-NEXT:       - Index:           7
 ; CHECK-NEXT:         Locals:
 ; CHECK-NEXT:         Body:            1082808080000B
 ; CHECK-NEXT:       - Index:           8
 ; CHECK-NEXT:         Locals:
-; CHECK-NEXT:         Body:            02404182808080004100418080808000108180808000450D00000B0B
+; CHECK-NEXT:         Body:            02404182808080004100418080808000108180808000450D0000000B0B
 ; CHECK-NEXT:   - Type:            DATA
 ; CHECK-NEXT:     Segments:
 ; CHECK-NEXT:       - SectionOffset:   6