ES31: Add swizzle support in SSBO (Part 1) This patch adds the swizzle process if the swizzle node is the last node in ssbo access chain. Bug: angleproject:1951 Change-Id: Iecc95baa45e8cc40be9111a15398c7e858bfb99e Reviewed-on: https://chromium-review.googlesource.com/c/1341234 Commit-Queue: Jiajia Qin <jiajia.qin@intel.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>