[Flang][Lower] NFC: Update target-features/target-cpu tests (#80984)

Previously, some of these lowering tests inadvertently relied on a
default triple not introducing any target features. This caused failures
when compiling on a ppc64le-linux-unknown-gnu system.

This patch updates these lowering tests to always explicitly set the
target triple and check that the -target-cpu and -target-features
compiler options are processed as expected.

Author: skatrak

flang/test/Lower/target-features-amdgcn.f90

@@ -1,21 +1,22 @@
 ! REQUIRES: amdgpu-registered-target
-! RUN: %flang_fc1 -emit-fir %s -o - | FileCheck %s --check-prefixes=ALL,NONE
-! RUN: %flang_fc1 -emit-fir -triple amdgcn-amd-amdhsa %s -o - | FileCheck %s --check-prefixes=ALL,TRIPLE
-! RUN: %flang_fc1 -emit-fir -target-cpu gfx90a %s -o - | FileCheck %s --check-prefixes=ALL,CPU
-! RUN: %flang_fc1 -emit-fir -triple amdgcn-amd-amdhsa -target-cpu gfx90a %s -o - | FileCheck %s --check-prefixes=ALL,BOTH
+! RUN: %flang_fc1 -emit-fir -triple amdgcn-amd-amdhsa -target-cpu gfx90a %s -o - | FileCheck %s --check-prefixes=ALL,CPU
+! RUN: %flang_fc1 -emit-fir -triple amdgcn-amd-amdhsa -target-feature +sse %s -o - | FileCheck %s --check-prefixes=ALL,FEATURE
+! RUN: %flang_fc1 -emit-fir -triple amdgcn-amd-amdhsa -target-cpu gfx90a -target-feature +sse %s -o - | FileCheck %s --check-prefixes=ALL,BOTH
 
 ! ALL: module attributes {
 
-! NONE-NOT: fir.target_cpu
-! NONE-NOT: fir.target_features
-
-! TRIPLE-SAME: fir.target_cpu = "generic-hsa"
-! TRIPLE-NOT: fir.target_features
-
 ! CPU-SAME: fir.target_cpu = "gfx90a"
-! CPU-NOT: fir.target_features
+! CPU-SAME: fir.target_features = #llvm.target_features<[
+! CPU-SAME: "+gfx90a-insts"
+! CPU-SAME: ]>
+
+! FEATURE-SAME: fir.target_features = #llvm.target_features<[
+! FEATURE-NOT:  "+gfx90a-insts"
+! FEATURE-SAME: "+sse"
+! FEATURE-SAME: ]>
 
 ! BOTH-SAME: fir.target_cpu = "gfx90a"
 ! BOTH-SAME: fir.target_features = #llvm.target_features<[
 ! BOTH-SAME: "+gfx90a-insts"
+! BOTH-SAME: "+sse"
 ! BOTH-SAME: ]>

flang/test/Lower/target-features-x86_64.f90

@@ -1,19 +1,17 @@
 ! REQUIRES: x86-registered-target
-! RUN: %flang_fc1 -emit-fir -triple x86_64-unknown-linux-gnu %s -o - | FileCheck %s --check-prefixes=ALL,NONE
 ! RUN: %flang_fc1 -emit-fir -triple x86_64-unknown-linux-gnu -target-cpu x86-64 %s -o - | FileCheck %s --check-prefixes=ALL,CPU
 ! RUN: %flang_fc1 -emit-fir -triple x86_64-unknown-linux-gnu -target-feature +sse %s -o - | FileCheck %s --check-prefixes=ALL,FEATURE
 ! RUN: %flang_fc1 -emit-fir -triple x86_64-unknown-linux-gnu -target-cpu x86-64 -target-feature +sse %s -o - | FileCheck %s --check-prefixes=ALL,BOTH
 
 ! ALL: module attributes {
 
-! NONE-NOT: fir.target_cpu
-! NONE-NOT: fir.target_features
+! CPU-SAME:     fir.target_cpu = "x86-64"
 
-! CPU-SAME: fir.target_cpu = "x86-64"
-! CPU-NOT: fir.target_features
-
-! FEATURE-NOT: fir.target_cpu
-! FEATURE-SAME: fir.target_features = #llvm.target_features<["+sse"]>
+! FEATURE-SAME: fir.target_features = #llvm.target_features<[
+! FEATURE-SAME: "+sse"
+! FEATURE-SAME: ]>
 
 ! BOTH-SAME: fir.target_cpu = "x86-64"
-! BOTH-SAME: fir.target_features = #llvm.target_features<["+sse"]>
+! BOTH-SAME: fir.target_features = #llvm.target_features<[
+! BOTH-SAME: "+sse"
+! BOTH-SAME: ]>