[clang] [clang] Emitting a warning if optimizations are enabled with sanitizers (PR #95934)

[Sandeep Kosuri via cfe-commits]

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@@ -477,6 +477,8 @@ def warn_drv_disabling_vptr_no_rtti_default : Warning<
 def warn_drv_object_size_disabled_O0 : Warning<
   "the object size sanitizer has no effect at -O0, but is explicitly enabled: %0">,
   InGroup<InvalidCommandLineArgument>, DefaultWarnNoWerror;
+def warn_sanitizer_with_optimization : Warning<
+  "enabling optimizations with sanitizers may potentially reduce effectiveness">;
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sandeepkosuri wrote:

```suggestion
  "enabling optimizations may reduce the effectiveness of sanitizers">;
```

https://github.com/llvm/llvm-project/pull/95934