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

     1. store_src_rg                   coords = src.rg
     2. init_lane_masks                CondMask = LoopMask = RetMask = true
     3. copy_4_constants               $0..3 = colorGreen
     4. load_src                       src.rgba = $0..3
	1. store_src_rg coords = src.rg
	2. init_lane_masks CondMask = LoopMask = RetMask = true
	3. copy_4_constants $0..3 = colorGreen
	4. load_src src.rgba = $0..3