[clang] [clang] Avoid stack exhaustion in recursive `constexpr` calls (PR #201706)

[Daniil Dudkin via cfe-commits]

unterumarmung wrote:

I'm sorry if I made a rush decision to merge it. Purely technically, the issue seems to be fixed — the crash doesn't happen anymore. If there's more cases when FloatExprEvaluator crashes, we can either reopen the existing issue or create a new one

https://github.com/llvm/llvm-project/pull/201706