Pack skcms_Curve better

This saves 104 bytes (out of 992) on 64 bit platforms. Anonymous unions
and structs can easily get us another 104, but I can't get the ideal
packing (that would save yet another 104) to work, so I'm taking the low
hanging fruit for now.

Change-Id: I6a69a4ea45a570f853ece11c511f1e276de4e45b
Reviewed-on: https://skia-review.googlesource.com/113745
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed