Metal: Set alphaToCoverageEnabled in checkIfPipelineChanged alphaToCoverageEnabled was tweaked to false for non-multisampled rendering cases in RenderPipelineCache::createRenderPipelineState but this caused a copy and could be done much earlier during context state syncing. Bug: chromium:1329376 Change-Id: I37a461554e1e2b162313b4a952baa1526356db3d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4608484 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Quyen Le <lehoangquyen@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>