[Clang] prevent an assertion failure caused by C++ constant expression checks in C23 floating conversions (#174113) Fixes #173847 --- This patch addresses an assertion failure during compilation of C23 code involving floating-point conversions. As part of the C23 constexpr support introduced in PR #73099, Clang began reusing parts of the C++ constant evaluation and narrowing logic. In C23 mode, a failed constant evaluation caused the condition to proceed to C++ constant-expression checks, resulting in an assertion failure. This change evaluates constants using `EvaluateAsRValue` in C23 mode and restricts C++ constant-expression checks to C++ mode.
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