R600: Add an explicit default processor

This is for the case when no processor is passed to the backend.  This
prevents the

'' is not a recognized processor for this target (ignoring processor)

warning from being generated by clang.
R600/SI: add proper 64bit immediate support v2

v2: rebased on current upstream

Patch by: Christian König

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
R600/SI: simplify and fix SMRD encoding

The _SGPR variants where wrong.

Patch by: Christian König

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
R600/SI: Add pattern for mul.

20 more little piglits with radeonsi.

Patch by: Michel Dänzer

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
R600/SI: Handle VGPR64 destination in copyPhysReg().

Allows nexuiz to run with radeonsi.

Patch by: Michel Dänzer

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Tom Stellard <thomas.stellard@amd.com>
R600/SI: cleanup VGPR encoding

Remove all the unused code.

Patch by: Christian König

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