[clang] [Clang] Add '-Warray-compare' flag for C++ below version 20 (PR #118031)

[Erich Keane via cfe-commits]

================
@@ -15,15 +15,15 @@ void test(const char *d) {
   if (NULL == "/")
     return;
   if ("/" != DELIM) // expected-warning {{result of comparison against a string literal is unspecified (use an explicit string comparison function instead)}}
-    return;
+    return;         // cxx-warning at -1 {{comparison between two arrays}}
----------------
erichkeane wrote:

Oooh, thats a great concern!  I think you're right, but I think as well that it is ok to do in the followup


https://github.com/llvm/llvm-project/pull/118031