R600/SI: Add VI versions of LDS atomics

Each class is split into two: one adds let statements around non-pseudos,
and the other one specifies the parameters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227211 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed