[llvm] [LLVM][Demangle] Fix MS Demangler to be stricter about wide string literals (PR #134483)

[Aaron Ballman via llvm-commits]

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@@ -70,6 +70,8 @@ Changes to LLVM infrastructure
 
 * Removed support for target intrinsics being defined in the target directories
   themselves (i.e., the `TargetIntrinsicInfo` class).
+* Fix Microsoft demanling of string literals to be stricter
+  ([Fixes 129970](https://github.com/llvm/llvm-project/issues/129970))
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AaronBallman wrote:

```suggestion
  (#GH129970)
```

https://github.com/llvm/llvm-project/pull/134483