[AMDGPU][MC] Added check for truncation of SOPK imm operand

See bug 30827: https://bugs.llvm.org//show_bug.cgi?id=30827

Reviewers: artem.tamazov, vpykhtin

Differential Revision: https://reviews.llvm.org/D32535

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301418 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed