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>