more careful SkColorSpace hash collision detection

The new unit test SkASSERT()s a hash collision at head
(but passes in release builds) and does not SkASSERT()
with this patch to SkColorSpace.cpp.

Bug: chromium:1113865
Change-Id: Ibc05af4145a92bbd15c7d5e06ece9d269bd7a242
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/310110
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed