AMDGPU/SI: Remove REGISTER_STORE/REGISTER_LOAD code which is now dead

Reviewers: arsenm

Subscribers: arsenm, llvm-commits

Differential Revision: http://reviews.llvm.org/D15050

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254427 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed