r600g: split resource emit path from main register emit path

r600g: split resource emit path from main register emit path

Since resources don't generally vary in size, this splits
the emit path, it also takes into a/c that texture and vertex resources
have different number of relocs, and avoids emitting the extra
reloc for vertex resources.

Signed-off-by: Dave Airlie <airlied@redhat.com>