Integrate clamp to border into FP optimization flags

Bug: skia:
Change-Id: I89bf20a06942e8d00168c5e8b50b336e99785b9a
Reviewed-on: https://skia-review.googlesource.com/c/177502
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
9 files changed