[clang] [Clang] Fix oversized bit-field layout on big-endian targets (PR #225494)

[Victor Campos via cfe-commits]

vhscampos wrote:

For Arm big endian the ABI change is fine. We are keen on having the fix in.

I will try to review the PR later today.

https://github.com/llvm/llvm-project/pull/225494