Vulkan: Only apply MSAA FF fix up if executable has FF Due to the permanentlySwitchToFramebufferFetchMode feature, framebuffer fetch is permanently enabled on first use. Checking GraphicsPipelineDesc as previously done would thus always return true, even if the executable does not use framebuffer fetch. As a side effect, every multisampled draw turned into a per-sample shading draw. Bug: angleproject:6195 Change-Id: I748abddd2003297d6ff37a98e69cce4621697ad7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3763064 Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Yuxin Hu <yuxinhu@google.com>