i965: fix bug in pass0_precalc_mov()

Previously, "in-place" swizzles such as:
   MOV t, t.xxyx;
were handled incorrectly.  Fixed by splitting the one loop into two loops so we
get all the refs before assigning them (to avoid potential clobbering).

(cherry picked from master/commit faa48915d27634a12f123eaa6e954ec79565e365)
1 file changed