[clang] [clang] increase default constexpr step limit (PR #143785)

[via cfe-commits]

https://github.com/Sirraide commented:

This seems reasonable to me.

This should also come with a release note (in clang/docs/ReleaseNotes.rst); not sure in what section though.

https://github.com/llvm/llvm-project/pull/143785