[clang] [llvm] Remove -bounds-checking-unique-traps (replace with -fno-sanitize-merge=local-bounds) (PR #120682)

[Vitaly Buka via llvm-commits]

================
@@ -488,8 +489,11 @@ Removed Compiler Flags
   derivatives) is now removed, since it's no longer possible to suppress the
   diagnostic (see above). Users can expect an `unknown warning` diagnostic if
   it's still in use.
-- The experimental flag '-ubsan-unique-traps' has been removed. It is
-  superseded by '-fno-sanitize-merge'.
+- The experimental flags '-ubsan-unique-traps' and
----------------
vitalybuka wrote:

this is -mllvm flag, they don't worth mentioning 

https://github.com/llvm/llvm-project/pull/120682