Vulkan: Don't flush depth/stencil on color blit When syncing the read framebuffer for blit, deferred clears are picked up for the attachments that are not being synced. They are then redeferred so a future command would pick them hopefully as loadOp. This change improves the frame time of Pretty Derby on Pixel 6 by ~23%. Bug: angleproject:7727 Change-Id: Ie7d84c58315cd09204e5229f1ec73605d5a7f639 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3931973 Reviewed-by: Charlie Lao <cclao@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>