[clang] [Clang][Sema]:Fix musttail attribute on a function with not_tail_called attribute has no warning/error (PR #134465)

[Aaron Ballman via cfe-commits]

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@@ -325,6 +325,9 @@ Improvements to Clang's diagnostics
 - Now correctly diagnose a tentative definition of an array with static
   storage duration in pedantic mode in C. (#GH50661)
 
+- The ``-err-musttail-mismatch`` error is emitted when a musttail call is made to a function marked with the not_tail_called attribute.(#133509).
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AaronBallman wrote:

```suggestion
- An error is now emitted when a ``musttail`` call is made to a function marked with the ``not_tail_called`` attribute. (#GH133509).
```

https://github.com/llvm/llvm-project/pull/134465