Add dci/ici instructions for PPC 476 and friends.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214864 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Avoid generating REGISTER_LOAD instructions.

SI doesn't use REGISTER_LOAD anymore, but it was still hitting this code
path for 8-bit and 16-bit private loads.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214865 91177308-0d34-0410-b5e6-96231b3b80d8