intel/fs: Properly handle 64-bit types in LOAD_PAYLOAD

intel/fs: Properly handle 64-bit types in LOAD_PAYLOAD

By just assigning dst.type to src[i].type, we ensure that the offset at
the end of the loop actually offsets it by the right number of
registers.  Otherwise, we'll get into a case where we copy with a Q type
and then offset with a D type and things get out of sync.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>