[clang] [clang] Lower _BitInt(129+) to a different type in LLVM IR (PR #91364)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> Ping!

CC @rjmccall and @efriedma-quic -- we're still hoping to get this resolved for Clang 19 and the branch date is Tue Jul 23, so it's coming up quickly.

https://github.com/llvm/llvm-project/pull/91364