[clang] [flang] [clang][OpenMP] Diagnose invalid allocator in `#pragma omp allocate`; avoid null deref (PR #158146)

[Shafik Yaghmour via cfe-commits]

================
@@ -3321,27 +3321,33 @@ SemaOpenMP::CheckOMPThreadPrivateDecl(SourceLocation 
Loc,
   }
   return D;
 }
-
 static OMPAllocateDeclAttr::AllocatorTypeTy
 getAllocatorKind(Sema &S, DSAStackTy *Stack, Expr *Allocator) {
+  // No allocator expression → Null mem alloc (matches existing tests).
   if (!Allocator)
     return OMPAllocateDeclAttr::OMPNullMemAlloc;
+
   if (Allocator->isTypeDependent() || Allocator->isValueDependent() ||
       Allocator->isInstantiationDependent() ||
       Allocator->containsUnexpandedParameterPack())
     return OMPAllocateDeclAttr::OMPUserDefinedMemAlloc;
+
   auto AllocatorKindRes = OMPAllocateDeclAttr::OMPUserDefinedMemAlloc;
+
   llvm::FoldingSetNodeID AEId;
   const Expr *AE = Allocator->IgnoreParenImpCasts();
-  AE->IgnoreImpCasts()->Profile(AEId, S.getASTContext(), /*Canonical=*/true);
+  AE->Profile(AEId, S.getASTContext(), /*Canonical=*/true);
----------------
shafik wrote:

Please explain why you removed `IgnoreImpCasts`

https://github.com/llvm/llvm-project/pull/158146
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