[clang] [Clang] Separate implicit int conversion on negation sign to new diagnostic group (PR #139429)

[Aaron Ballman via cfe-commits]

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@@ -352,6 +352,9 @@ Improvements to Clang's diagnostics
 - Now correctly diagnose a tentative definition of an array with static
   storage duration in pedantic mode in C. (#GH50661)
 
+- Split diagnosis of implicit integer comparison on negation to a new diagnostic group ``-Wimplicit-int-comparison-on-negation``, 
+  so user can turn it off independently.
----------------
AaronBallman wrote:

```suggestion
- Split diagnosis of implicit integer comparison on negation to a new
  diagnostic group ``-Wimplicit-int-comparison-on-negation``, grouped under
  ``-Wimplicit-int-conversion``, so user can turn it off independently.
```

https://github.com/llvm/llvm-project/pull/139429