[Clang] Fix crash on invalid size in user-defined `static_assert` message (#89420)
This addresses two problems observed in #89407 wrt user-defined
`static_assert` messages:
1. In `Expr::EvaluateCharRangeAsString`, we were calling `getExtValue()`
instead of `getZExtValue()`, which would assert if a negative or very
large number was returned from `size()`.
2. If the value could not be converted to `std::size_t`, attempting to
diagnose that would crash because `ext_cce_narrowing` was missing two
`%select` cases.
This fixes #89407.
GitOrigin-RevId: b6628c24ef017138b8d6eb288e94c141e7c846b0
4 files changed
