Use memoryBarrier to sync image load and store Image load and store are incoherent memory access operations, so need to use memoryBarrier to ensure the visibility of incoherent memory access operations with other operations. Bug: angleproject:3044 Change-Id: I4d474d260a3199c026911de8d20878cd327d16c6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1677420 Commit-Queue: Xinghua Cao <xinghua.cao@intel.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>