Suppress float-cast-overflow in SkPoint::Length.

Bug: skia:4632
Change-Id: I0f8a7d7a11fc76fcb315c3f0183577c3f0958926
Reviewed-on: https://skia-review.googlesource.com/47421
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
4 files changed