clang/openmp: Fix alignment for ThreadID Address variables

There are places in the runtime, like __kmp_init_indirect_csptr, which
assume these pointers are aligned to sizeof(void*), so make sure we emit
them with the correct alignment.

Fixes #62668

Reviewed By: jlpeyton

Differential Revision: https://reviews.llvm.org/D150723

clang/lib/CodeGen/CGOpenMPRuntime.cpp

@@ -2143,7 +2143,11 @@ Address CGOpenMPRuntime::emitThreadIDAddress(CodeGenFunction &CGF,
 llvm::Value *CGOpenMPRuntime::getCriticalRegionLock(StringRef CriticalName) {
   std::string Prefix = Twine("gomp_critical_user_", CriticalName).str();
   std::string Name = getName({Prefix, "var"});
-  return OMPBuilder.getOrCreateInternalVariable(KmpCriticalNameTy, Name);
+  llvm::GlobalVariable *G = OMPBuilder.getOrCreateInternalVariable(KmpCriticalNameTy, Name);
+  llvm::Align PtrAlign = OMPBuilder.M.getDataLayout().getPointerABIAlignment(G->getAddressSpace());
+  if (PtrAlign > llvm::Align(G->getAlignment()))
+    G->setAlignment(PtrAlign);
+  return G;
 }
 
 namespace {

clang/test/OpenMP/for_reduction_codegen.cpp

@@ -1,4 +1,4 @@
-// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature --include-generated-funcs --replace-value-regex "__omp_offloading_[0-9a-z]+_[0-9a-z]+" "reduction_size[.].+[.]" "pl_cond[.].+[.|,]" --prefix-filecheck-ir-name _
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature --check-globals --include-generated-funcs --replace-value-regex "__omp_offloading_[0-9a-z]+_[0-9a-z]+" "reduction_size[.].+[.]" "pl_cond[.].+[.|,]" --prefix-filecheck-ir-name _ --global-value-regex ".gomp_critical_user[a-zA-Z_.]+"
 // RUN: %clang_cc1 -verify -fopenmp -x c++ -triple x86_64-apple-darwin10 -emit-llvm %s -o - | FileCheck -allow-deprecated-dag-overlap %s --check-prefix=CHECK1
 // RUN: %clang_cc1 -fopenmp -x c++ -std=c++11 -triple x86_64-apple-darwin10 -emit-pch -o %t %s
 // RUN: %clang_cc1 -fopenmp -x c++ -triple x86_64-apple-darwin10 -std=c++11 -include-pch %t -verify %s -emit-llvm -o - | FileCheck -allow-deprecated-dag-overlap %s --check-prefix=CHECK1
@@ -527,6 +527,14 @@ int main() {
 
 
 #endif
+//.
+// CHECK1: @.gomp_critical_user_.reduction.var = common global [8 x i32] zeroinitializer, align 8
+// CHECK1: @.gomp_critical_user_.atomic_reduction.var = common global [8 x i32] zeroinitializer, align 8
+//.
+// CHECK3: @.gomp_critical_user_.reduction.var = common global [8 x i32] zeroinitializer, align 8
+//.
+// CHECK4: @.gomp_critical_user_.reduction.var = common global [8 x i32] zeroinitializer, align 8
+//.
 // CHECK1-LABEL: define {{[^@]+}}@main
 // CHECK1-SAME: () #[[ATTR0:[0-9]+]] {
 // CHECK1-NEXT:  entry: