R600/SI: Add intrinsic for S_SENDMSG instruction

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200195 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Add intrinsic for BUFFER_LOAD_DWORD* instructions

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200196 91177308-0d34-0410-b5e6-96231b3b80d8