remove redundant comparison ops

Depending on data type and platform, there's usually only one of < or >
(and <= or >=) since you can trivially translate to the other by
swapping the arguments.  This CL bubbles that insight up one level to
our mid-level skvm::Op enum, arbitrarily keeping > and >=.  Nothing
changes from the perspective of an skvm user.

Change-Id: Ia271436cc2b9916b761320769a715a3952e4ce41
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253199
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed