[clang] [Clang][ExprConstant] fix constant expression did not evaluate to integer (PR #97146)

[via cfe-commits]

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@@ -936,6 +936,7 @@ Bug Fixes to C++ Support
   forward-declared class. (#GH93512).
 - Fixed a bug in access checking inside return-type-requirement of compound requirements. (#GH93788).
 - Fixed an assertion failure about invalid conversion when calling lambda. (#GH96205).
+- Fixed an assertion failure about constant expression did not evaluate to integer. (#GH96670).
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Sirraide wrote:

```suggestion
- Fixed an assertion failure about a constant expression not evaluating to an integer. (#GH96670).
```
I realise that that is what the assertion says, but we should rephrase this a bit so people don’t get an anyeurism reading the release notes ;Þ

https://github.com/llvm/llvm-project/pull/97146