[AMDGPU][MC] Added support of lds_direct operand

See bug 39293: https://bugs.llvm.org/show_bug.cgi?id=39293

Reviewers: artem.tamazov, rampitec

Differential Revision: https://reviews.llvm.org/D57889

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353524 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed