[clang] [clang] Fix crashes when passing VLA to va_arg (PR #119563)

[Eli Friedman via cfe-commits]

================
@@ -16538,6 +16538,13 @@ ExprResult Sema::BuildVAArgExpr(SourceLocation 
BuiltinLoc,
         << TInfo->getTypeLoc().getSourceRange();
     }
 
+    if (TInfo->getType()->isVariableArrayType()) {
----------------
efriedma-quic wrote:

This should check for any array type; the issue with compatibility isn't 
specific to variadic arrays.

https://github.com/llvm/llvm-project/pull/119563
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