[clang] `__noop` not marked as constexpr #102064 (PR #105983)

[via cfe-commits]

ofAlpaca wrote:

@DanielJump
Could you kindly help me review my commit?
Besides, I'm not sure how to solve the failed build test on GitHub.
The failed case is `C:\ws\src\clang\unittests\Support\TimeProfilerTest.cpp:278` on Windows platform.
It shows the following difference.
```
With diff:
@@ -7,5 +7,5 @@
 | | ParseFunctionDefinition (user)
 | PerformPendingInstantiations
-| | InstantiateFunction (fooA<int>, ./a.h:7)
-| | | InstantiateFunction (fooB<int>, ./b.h:3)
-| | | InstantiateFunction (fooMTA<int>, ./a.h:4)\n
+| | InstantiateFunction (fooA<int>, .\\a.h:7)
+| | | InstantiateFunction (fooB<int>, .\\b.h:3)
+| | | InstantiateFunction (fooMTA<int>, .\\a.h:4)\n
```
It looks like the problem is about Windows's backslash.
However, I don't know how this error relates to my code.

https://github.com/llvm/llvm-project/pull/105983