R600/SI: Remove vaddr operand from BUFFER_LOAD_*_OFFSET instructions

This operand is never used.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213549 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Specify wavefront size for SI and CI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213550 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Use scratch memory for large private arrays

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213551 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Clean up some of the unused REGISTER_{LOAD,STORE} code

There are a few more cleanups to do, but I ran into some problems
with ext loads and trunc stores, when I tried to change some of the
vector loads and stores from custom to legal, so I wasn't able to
get rid of everything.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213552 91177308-0d34-0410-b5e6-96231b3b80d8