[clang] [Clang] Partially fix m68k alignments (PR #144740)

[Min-Yih Hsu via cfe-commits]

https://github.com/mshockwave approved this pull request.

LGTM thanks. Sorry this PR slipped under my radar.
Just a little bit more context: 68k GCC actually uses a different ABI than 68k's SysV ABI: https://m680x0.github.io/doc/abi#scalar-types . And we decided to implement GCC's ABI for now.

https://github.com/llvm/llvm-project/pull/144740