i965/fs: Push small uniform arrays

i965/fs: Push small uniform arrays

Unfortunately, this also means that we need to use a slightly different
algorithm for assign_constant_locations.  The old algorithm worked based on
the assumption that each read of a uniform value read exactly one float.
If it encountered a MOV_INDIRECT, it would immediately bail and push the
whole thing.  Since we can now read ranges using MOV_INDIRECT, we need to
be able to push a series of floats without breaking them up.  To do this,
we use an algorithm similar to the on in split_virtual_grfs.