Clamp in GrBicubicEffect (to match SW and for general sanity) Bug: skia:8809 Change-Id: I9f5b6428113602929b3a1b45c25b623e8da0e264 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/200512 Commit-Queue: Brian Osman <brianosman@google.com> Reviewed-by: Mike Klein <mtklein@google.com> Reviewed-by: Robert Phillips <robertphillips@google.com>