[clang] [clang][OpenMP] Fix crashes on target regions inside namespace-scope lambdas and blocks (PR #226691)

[Akash Manna via cfe-commits]

akash-manna-sky wrote:

> Block and variable-template cases still crash, in CodeGen — clang/test/OpenMP/target_global_ref_namespace_scope_lambda.cpp
> 
> ```
> --- a/clang/lib/CodeGen/CGStmtOpenMP.cpp
> +++ b/clang/lib/CodeGen/CGStmtOpenMP.cpp
> @@ -7544,9 +7544,13 @@
> -  assert(CGF.CurFuncDecl && "No parent declaration for target region!");
>    StringRef ParentName;
>    // In case we have Ctors/Dtors we use the complete type variant to produce
>    // the mangling of the device outlined kernel.
> -  if (const auto *D = dyn_cast<CXXConstructorDecl>(CGF.CurFuncDecl))
> +  if (!CGF.CurFuncDecl)
> +    // A target region in a namespace-scope block or a variable template
> +    // initializer has no parent function declaration; use the name of the
> +    // function being emitted.
> +    ParentName = CGF.CurFn->getName();
> +  else if (const auto *D = dyn_cast<CXXConstructorDecl>(CGF.CurFuncDecl))
>      ParentName = CGM.getMangledName(GlobalDecl(D, Ctor_Complete));
> ```

I applied your suggestions.

https://github.com/llvm/llvm-project/pull/226691