[clang] [clang] Improve diagnostics for constraints of inline asm (NFC) (PR #96363)

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Sirraide wrote:

> Initially I've implemented the target errors through std::string. Then changed to diag::kind after reading InternalsManual. I'm not sure what is better.

Hmm, if they’re not changing very often (if at all), then I’d also use DiagIDs for this, yeah.


https://github.com/llvm/llvm-project/pull/96363