[Review] Add test

Author: jmmartinez

clang/test/CodeGen/llvm_compiler_used_elements_are_unqual.c

@@ -0,0 +1,38 @@
+// RUN: %clang_cc1 -triple x86_64-- -emit-llvm -x c %s -o - \
+// RUN:   | FileCheck %s --check-prefix=X86
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -emit-llvm -x c %s -o - \
+// RUN:   | FileCheck %s --check-prefix=AMDGCN
+// RUN: %clang_cc1 -triple spirv64-- -emit-llvm -x c %s -o - \
+// RUN:   | FileCheck %s --check-prefix=SPIRV
+// RUN: %clang_cc1 -triple spirv64-amd-amdhsa -emit-llvm -x c %s -o - \
+// RUN:   | FileCheck %s --check-prefix=SPIRV_AMD
+
+static __attribute__((__used__)) int foo = 42;
+
+
+// X86: @foo = internal global i32 42, align 4
+// X86: @llvm.compiler.used = appending global [2 x ptr] [ptr @foo, ptr @bar], section "llvm.metadata"
+//.
+// AMDGCN: @foo = internal addrspace(1) global i32 42, align 4
+// AMDGCN: @llvm.compiler.used = appending addrspace(1) global [2 x ptr] [ptr addrspacecast (ptr addrspace(1) @foo to ptr), ptr @bar], section "llvm.metadata"
+//.
+// SPIRV: @foo = internal global i32 42, align 4
+// SPIRV: @llvm.used = appending addrspace(1) global [2 x ptr] [ptr @foo, ptr @bar], section "llvm.metadata"
+//.
+// SPIRV_AMD: @foo = internal addrspace(1) global i32 42, align 4
+// SPIRV_AMD: @llvm.used = appending addrspace(1) global [2 x ptr] [ptr addrspacecast (ptr addrspace(1) @foo to ptr), ptr addrspacecast (ptr addrspace(4) @bar to ptr)], section "llvm.metadata"
+//.
+// X86-LABEL: define internal void @bar(
+// X86-SAME: ) #[[ATTR0:[0-9]+]] {
+//
+// AMDGCN-LABEL: define internal void @bar(
+// AMDGCN-SAME: ) #[[ATTR0:[0-9]+]] {
+//
+// SPIRV-LABEL: define internal spir_func void @bar(
+// SPIRV-SAME: ) #[[ATTR0:[0-9]+]] {
+//
+// SPIRV_AMD-LABEL: define internal spir_func void @bar(
+// SPIRV_AMD-SAME: ) addrspace(4) #[[ATTR0:[0-9]+]] {
+//
+static void __attribute__((__used__)) bar() {
+}