[AMDGPU] Added v5i32 and v5f32 register classes

They are not used by anything yet, but a subsequent commit will start
using them for image ops that return 5 dwords.

Differential Revision: https://reviews.llvm.org/D58903

Change-Id: I63e1904081e39a6d66e4eb96d51df25ad399d271

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356735 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed