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

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@@ -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>();
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Sirraide wrote:

Right, I think what I was remembering then is that we might sometimes end up w/ prototypeless functions in the analysis code, but we just don’t do much w/ them.

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