[clang] [clang][ExprConst] Add diagnostics for invalid binary arithmetic (PR #118475)

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Timm =?utf-8?q?B=C3=A4der?= <tbaeder at redhat.com>,
Timm =?utf-8?q?B=C3=A4der?= <tbaeder at redhat.com>,
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https://github.com/cor3ntin approved this pull request.

Can you add a release note?
LGTM otherwise

https://github.com/llvm/llvm-project/pull/118475