igl | Fix unused variables within VulkanImage when building without a…

…sserts.

Summary: Always written to, never read from, IFF the asserts are disabled.

Reviewed By: corporateshark

Differential Revision: D62555941

fbshipit-source-id: 75a587f77ba530710c375c914dc49988ce0a2f05

src/igl/vulkan/VulkanImage.cpp

@@ -895,6 +895,7 @@ void VulkanImage::transitionLayout(VkCommandBuffer cmdBuf,
     srcRemainingMask &= ~VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT;
   }
 
+  (void)srcRemainingMask;
   IGL_ASSERT_MSG(
       srcRemainingMask == 0,
       "Automatic access mask deduction is not implemented (yet) for this srcStageMask = %u",
@@ -942,6 +943,7 @@ void VulkanImage::transitionLayout(VkCommandBuffer cmdBuf,
     dstRemainingMask &= ~VK_PIPELINE_STAGE_TRANSFER_BIT;
   }
 
+  (void)dstRemainingMask;
   IGL_ASSERT_MSG(
       dstRemainingMask == 0,
       "Automatic access mask deduction is not implemented (yet) for this dstStageMask = %u",