R600: Support for TBO

NOTE: This is a candidate for the Mesa stable branch.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175445 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Use MULADD_IEEE/V_MAD_F32 instruction for mad pattern

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175446 91177308-0d34-0410-b5e6-96231b3b80d8