[clang] [Clang] Fix assertion when __block is used on global variables in C mode (PR #183988)

[Yanzuo Liu via cfe-commits]

================
@@ -1711,6 +1711,13 @@ void SemaObjC::handleBlocksAttr(Decl *D, const 
ParsedAttr &AL) {
     return;
   }
 
+  VarDecl *VD = dyn_cast<VarDecl>(D);
+  if (!VD || !VD->hasLocalStorage()) {
+    Diag(AL.getLoc(), diag::err_block_on_nonlocal) << AL;
+    D->setInvalidDecl();
----------------
zwuis wrote:

We can remove marking it as invalid for better error recovery.

https://github.com/llvm/llvm-project/pull/183988
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