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

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

> Note that Halide has removed its dependency on the le32/le64 targets as of [halide/Halide#8344](https://github.com/halide/Halide/pull/8344).

Thank you for letting us know!

Does anyone know of any reasons we should not revert the revert (so le32/le64 is removed in Clang 20)?

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