R600/SI: replace AllReg_* with [SV]Src_* v2

Mark all the operands that can also have an immediate.

v2: SOFFSET is also an SSrc_32 operand

This is a candidate for the stable branch.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
llvm-svn: 175353