[AMDGPU][MC] Added support for several VI-specific opcodes (s_wakeup, etc)

Added support for VI:

- s_endpgm_saved
- s_wakeup
- s_rfe_restore_b64
- v_perm_b32

Enabled for VI:

- v_mov_fed_b32
- v_mov_fed_b32_e64

See bug 32593: https://bugs.llvm.org//show_bug.cgi?id=32593

Reviewers: artem.tamazov, vpykhtin

Differential Revision: https://reviews.llvm.org/D31931

llvm-svn: 300076