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

[Eli Friedman via cfe-commits]

efriedma-quic wrote:

I don't think FPGA folks will run into any practical issue with this; this only impacts the in-memory types, and backends shouldn't really be using in-memory types for anything anyways.

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