Reorder intrinsics to match sksl_public.

This made it easier to confirm the missing intrinsics that we still need
to implement (`matrixCompMult` and `mix`), and is easier to read than
the previous code which was not really ordered in any logical way. I
also discovered that I had implemented a handful of intrinsics that
weren't strictly required for ES2 support.

Change-Id: I02cf3835e88417279335283c11a4dea2296d7107
Bug: skia:12034
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/414336
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
1 file changed