[AMDGPU][MC][GFX9] Added instructions s_mul_hi_*32, s_lshl*_add_u32

See bugs
  36841: https://bugs.llvm.org/show_bug.cgi?id=36841
  36842: https://bugs.llvm.org/show_bug.cgi?id=36842

Differential Revision: https://reviews.llvm.org/D45251

Reviewers: artem.tamazov, arsenm, timcorringham

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329562 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed