Revert "[AArch64] Codegen support for FEAT_PAuthLR"

This reverts commit 5992ce90b8c0fac06436c3c86621fbf6d5398ee5.

Builtbot failures with expensive checks enabled.

GitOrigin-RevId: 9f0f5587426a4ff24b240018cf8bf3acc3c566ae
10 files changed