[Aarch64] handle "o" inline asm memory constraints

This Linux kernel is making use of this inline asm constraint which is
causing an ICE.

PR49956

Link: https://github.com/ClangBuiltLinux/linux/issues/1348

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D100412

GitOrigin-RevId: bb7016f8f50e1f1b8d388a9a42e3a7bb51254ca2
3 files changed