[clang] [Clang] Prevent potential null pointer dereferences (PR #117176)

[Doug Wyatt via cfe-commits]

================
@@ -627,7 +627,7 @@ class Analyzer {
           IsNoexcept = isNoexcept(FD);
         } else if (auto *BD = dyn_cast<BlockDecl>(D)) {
           if (auto *TSI = BD->getSignatureAsWritten()) {
-            auto *FPT = TSI->getType()->getAs<FunctionProtoType>();
+            auto *FPT = TSI->getType()->castAs<FunctionProtoType>();
----------------
dougsonos wrote:

I'm mobile and away from code until Monday, but IIRC effects are stored as 
trailing objects on FunctionProtoType and we simply don't allow them on 
prototype-less functions. I think there's a custom diagnostic if the user 
tries. The test is in something like Sema/attr-nonblocking-syntax.c.

https://github.com/llvm/llvm-project/pull/117176
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