tests/sksl/shared/StaticSwitch.skrp - skia - Git at Google

     1. store_src_rg                   xy = src.rg
     2. init_lane_masks                CondMask = LoopMask = RetMask = true
     3. copy_4_constants               $0..3 = colorGreen
     4. copy_4_slots_unmasked          [main].result = $0..3
     5. load_src                       src.rgba = [main].result
	1. store_src_rg xy = src.rg
	2. init_lane_masks CondMask = LoopMask = RetMask = true
	3. copy_4_constants $0..3 = colorGreen
	4. copy_4_slots_unmasked [main].result = $0..3
	5. load_src src.rgba = [main].result