[clang] [llvm] Finish deleting the le32/le64 targets (PR #98497)

[Steven Johnson via llvm-commits]

steven-johnson wrote:

After some initial experiments, it looks unlikely that a quick fix is possible on our side. May I suggest a revert with a (say) 30-day expiration date? That should give us enough time to come up with a fix on our side (which will actually be a drop-other-work-and-fix-it approach this time).

https://github.com/llvm/llvm-project/pull/98497