[clang] [clang] Check empty macro name in `#pragma push_macro("")` or `#pragma pop_macro("")` (PR #149982)

[Aaron Ballman via cfe-commits]

================
@@ -694,6 +694,9 @@ def err_pragma_push_pop_macro_malformed : Error<
 def warn_pragma_pop_macro_no_push : Warning<
    "pragma pop_macro could not pop '%0', no matching push_macro">,
   InGroup<IgnoredPragmas>;
+def warn_pargma_push_pop_macro_empty_string : Warning<
+   "#pragma %select{push_macro|pop_macro}0 expected a non-empty string">,
----------------
AaronBallman wrote:

```suggestion
   "'#pragma %select{push_macro|pop_macro}0' expected a non-empty string">,
```
Adding single quotes around the source constructs

https://github.com/llvm/llvm-project/pull/149982
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