[clang] [Clang] Warn when `std::atomic_thread_fence` is used with `fsanitize=thread` (PR #166542)

[Aaron Ballman via cfe-commits]

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@@ -112,6 +112,9 @@ def warn_max_unsigned_zero : Warning<
   "%select{a value and unsigned zero|unsigned zero and a value}0 "
   "is always equal to the other value">,
   InGroup<MaxUnsignedZero>;
+def warn_atomic_thread_fence_with_tsan : Warning<
+  "`std::atomic_thread_fence` is not supported with `-fsanitize=thread`">,
----------------
AaronBallman wrote:

```suggestion
  "'std::atomic_thread_fence' is not supported with '-fsanitize=thread'">,
```
Using straight quote instead of backtick

https://github.com/llvm/llvm-project/pull/166542