[clang] [WebAssembly][Clang] Add __builtin_wasm_ref_is_null_extern (PR #139580)

[Hood Chatham via cfe-commits]

================
@@ -52,14 +52,33 @@ static bool CheckWasmBuiltinArgIsInteger(Sema &S, CallExpr 
*E,
 }
 
 bool SemaWasm::BuiltinWasmRefNullExtern(CallExpr *TheCall) {
-  if (TheCall->getNumArgs() != 0)
+  if (TheCall->getNumArgs() != 0) {
----------------
hoodmane wrote:

Oh right, `getArg(1)` will fail if there is only one argument in the call 
expression. Okay I think I know how to fix this.


https://github.com/llvm/llvm-project/pull/139580
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