Revert "[CMake][compiler-rt][AArch64] Avoid preprocessing LSE builtins separately"

Causing issues on Apple buildbots.
http://green.lab.llvm.org/green/job/clang-stage1-RA/17019/console

This reverts commit 33b740f8dc3496237619a7bc6722f23655cb1f94.
This reverts commit d9697c2e6b153ac7dc40a69450d9b672f71b1029.

Differential Revision: https://reviews.llvm.org/D93199

GitOrigin-RevId: 617cd01a4b7abcb4be9dc0139bf3ed03f241608a
3 files changed