glsl: add a few missing int64 constant propagation cases
Fixes KHR-GL45.shader_ballot_tests.ShaderBallotAvailability, which causes some silly swizzles to appear, triggering this optimization to get hit. Signed-off-by:Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by:
Dave Airlie <airlied@redhat.com> Cc: mesa-stable@lists.freedesktop.org