pin in Sk4f_toL32()

It's looking too hairy to make SkNx_cast() itself pin.

There will be more of these that I'll have to work
through as they come up, hopefully by funneling them
through to this function.

Change-Id: I534e2dc612f30f2ea9692fd6b466ba59692ef4e2
Reviewed-on: https://skia-review.googlesource.com/154400
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed