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

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions c,h,cpp -- clang/include/clang/Sema/SemaWasm.h clang/lib/CodeGen/TargetBuiltins/WebAssembly.cpp clang/lib/Sema/SemaWasm.cpp clang/test/CodeGen/builtins-wasm.c clang/test/Sema/builtins-wasm.c
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaWasm.cpp b/clang/lib/Sema/SemaWasm.cpp
index 4157e179c..3842674cd 100644
--- a/clang/lib/Sema/SemaWasm.cpp
+++ b/clang/lib/Sema/SemaWasm.cpp
@@ -71,15 +71,14 @@ bool SemaWasm::BuiltinWasmRefIsNullExtern(CallExpr *TheCall) {
   Expr *ArgExpr = TheCall->getArg(0);
   if (!ArgExpr->getType().isWebAssemblyExternrefType()) {
     SemaRef.Diag(ArgExpr->getBeginLoc(),
-                  diag::err_wasm_builtin_arg_must_be_externref_type)
-           << 1 << ArgExpr->getSourceRange();
+                 diag::err_wasm_builtin_arg_must_be_externref_type)
+        << 1 << ArgExpr->getSourceRange();
     return true;
   }
 
   return false;
 }
 
-
 bool SemaWasm::BuiltinWasmRefNullFunc(CallExpr *TheCall) {
   ASTContext &Context = getASTContext();
   if (TheCall->getNumArgs() != 0) {

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