[clang] [llvm] [Clang][AIX] Add -mloadtime-comment-vars flag to preserve identifying variables (PR #187986)

[Tony Varghese via cfe-commits]

================
@@ -36,7 +36,7 @@ enum class Group;
 enum {
   DIAG_SIZE_COMMON = 300,
   DIAG_SIZE_DRIVER = 400,
-  DIAG_SIZE_FRONTEND = 200,
+  DIAG_SIZE_FRONTEND = 300,
----------------
tonykuttai wrote:

Created [[clang][NFC] Bump the maximum number of Frontend diagnostics](https://github.com/llvm/llvm-project/pull/210345#top) to do this cleanly.

https://github.com/llvm/llvm-project/pull/187986