Fix continue target in graphics block order tests
Fixes validation of shaders in:
dEQP-VK.spirv_assembly.instruction.graphics.selection_block_order.out_of_order_vert
dEQP-VK.spirv_assembly.instruction.graphics.selection_block_order.out_of_order_tessc
dEQP-VK.spirv_assembly.instruction.graphics.selection_block_order.out_of_order_tesse
dEQP-VK.spirv_assembly.instruction.graphics.selection_block_order.out_of_order_geom
dEQP-VK.spirv_assembly.instruction.graphics.selection_block_order.out_of_order_frag
dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_vert
dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_tessc
dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_tesse
dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_geom
dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_frag
dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_vert
dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_tessc
dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_tesse
dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_geom
dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_frag
Fixes https://gitlab.khronos.org/vulkan/vulkancts/issues/443