Capture: Add support for capturing (Get)ClipPlanef equation In addition, correctly handle "const GLfloat *" when replaying, and enable the according capture/replay tests Bug: angleproject:6047 Change-Id: I5dd7510d1b621d4c941490c9d0261559a96dd681 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2951133 Commit-Queue: Gert Wollny <gert.wollny@collabora.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>