R600/SI: Fix another case of illegal VGPR->SGPR copy

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195025 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Fix illegal VGPR->SGPR copy inside of loop

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195026 91177308-0d34-0410-b5e6-96231b3b80d8