[llvm] [x86] Synchronize fp128 and i128 ABI tests (nfc) (PR #147923)

[Trevor Gross via llvm-commits]

tgross35 wrote:

Great idea, did what you suggested and it's pretty clean. A second `sed` was needed to use either `0xL0` or `0` for a literal zero, not sure if there is something better to do here.

Renamed the file in the first commit so git history correctly reflects that the file is modified rather than deleted+re-added. If that's important, the first commit will need to be pushed before this PR merges.

https://github.com/llvm/llvm-project/pull/147923