R600/SI: Add support for i8 and i16 private loads/stores

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199823 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Begin private memory at the second GPR.

This way private memory does not over-write work group information
stored in GPRs 0 and 1.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199824 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Add support for global addresses with constant initializers

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199825 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Take alignment into account when calculating the stack offset

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199826 91177308-0d34-0410-b5e6-96231b3b80d8
R600: MOVA is vector only

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199827 91177308-0d34-0410-b5e6-96231b3b80d8