[NFC][Sema][OpenMP] Fix free-nonheap-object warning

This is one of the many PRs to fix errors with LLVM_ENABLE_WERROR=on. Built by GCC 11.

Fix warning

In destructor ‘llvm::APInt::~APInt()’,
    inlined from ‘llvm::APInt::~APInt()’ at llvm-project/llvm/include/llvm/ADT/APInt.h:190:3,
    inlined from ‘llvm::APSInt::~APSInt()’ at llvm-project/llvm/include/llvm/ADT/APSInt.h:23:21,
    inlined from ‘bool checkOMPArraySectionConstantForReduction(clang::ASTContext&, const clang::ArraySectionExpr*, bool&, llvm::SmallVectorImpl<llvm::APSInt>&)’ at llvm-project/clang/lib/Sema/SemaOpenMP.cpp:18357:45,
    inlined from ‘bool actOnOMPReductionKindClause(clang::Sema&, {anonymous}::DSAStackTy*, clang::OpenMPClauseKind, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::CXXScopeSpec&, const clang::DeclarationNameInfo&, llvm::ArrayRef<clang::Expr*>, {anonymous}::ReductionData&)’ at llvm-project/clang/lib/Sema/SemaOpenMP.cpp:18715:68:
llvm-project/llvm/include/llvm/ADT/APInt.h:192:18: error: ‘void operator delete [](void*)’ called on a pointer to an unallocated object ‘1’ [-Werror=free-nonheap-object]
  192 |       delete[] U.pVal;
      |                  ^~~~

Author: jsji

clang/lib/Sema/SemaOpenMP.cpp

@@ -18335,7 +18335,8 @@ static bool checkOMPArraySectionConstantForReduction(
         return false;
 
       // This is an array subscript which has implicit length 1!
-      ArraySizes.push_back(llvm::APSInt::get(1));
+      llvm::APSInt ConstantOne = llvm::APSInt::get(1);
+      ArraySizes.push_back(ConstantOne);
     } else {
       Expr::EvalResult Result;
       if (!Length->EvaluateAsInt(Result, Context))
@@ -18354,7 +18355,8 @@ static bool checkOMPArraySectionConstantForReduction(
   if (!SingleElement) {
     while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base)) {
       // Has implicit length 1!
-      ArraySizes.push_back(llvm::APSInt::get(1));
+      llvm::APSInt ConstantOne = llvm::APSInt::get(1);
+      ArraySizes.push_back(ConstantOne);
       Base = TempASE->getBase()->IgnoreParenImpCasts();
     }
   }