Vulkan: More micro-optimizations. Inlining more methods into headers. In total the patch series improves performance by about 60-70% in the Vulkan draw call overhead test. Bug: angleproject:2786 Change-Id: I70913ac6b3d5836c17c13e249950987df362f203 Reviewed-on: https://chromium-review.googlesource.com/1194883 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>