[clang] [NFC][clang] Split clang/lib/CodeGen/CGBuiltin.cpp into target-specific files (PR #132252)

[Jonathan Thackray via cfe-commits]

jthackray wrote:

> Seems something with AArch64 has made the CI unhappy as well.

Thanks. It appears `clang-format` breaks some of the fragile `#define`s around `NEONMAP0` and similar. If I revert the `clang-format`, it passes.

https://github.com/llvm/llvm-project/pull/132252