The following tests are failing due to invalid SPIR-V merge blocks:

  dEQP-VK.spirv_assembly.instruction.graphics.loop.break_frag
  dEQP-VK.spirv_assembly.instruction.graphics.loop.break_vert
  dEQP-VK.spirv_assembly.instruction.graphics.loop.continue_frag
  dEQP-VK.spirv_assembly.instruction.graphics.loop.continue_vert
  dEQP-VK.spirv_assembly.instruction.graphics.loop.multi_block_loop_construct_frag
  dEQP-VK.spirv_assembly.instruction.graphics.loop.multi_block_loop_construct_vert
  dEQP-VK.spirv_assembly.instruction.graphics.loop.return_frag
  dEQP-VK.spirv_assembly.instruction.graphics.loop.return_vert
  dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_frag
  dEQP-VK.spirv_assembly.instruction.graphics.opphi.out_of_order_vert
  dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_frag
  dEQP-VK.spirv_assembly.instruction.graphics.switch_block_order.out_of_order_vert

This fix is currently working its way through the dEQP branches.
Once it lands in 1.1.6, this change will be reverted and the dEQP SHA will be rolled forward.

Change-Id: Ib69aa6aeb09c89519ff669281ef839a8555946bc
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39878Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>