Fix TAP ASAN failure.

The current SkFixed3232 pinning logic in SkClampRange is not safe:
SkFixed3232ToFloat(SkFixed3232Max) and SkFixed3232ToFloat(SkFixed3232Min)
are not exactly representable in float, so they are not good SkTPin
limits.

Use the next representable float value towards zero.  Constants computed
with nextafterf(..., 0).

Change-Id: I8e2eb35b22f65077e8ce6055d670d90d2a163bae
Reviewed-on: https://skia-review.googlesource.com/8662
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
1 file changed