add a x*y+0 -> x*y peephole

This is mostly to test how easy rebaselining SkVMTest is.

Change-Id: I27ab6f6bb8b7e126327374009783afd86d416f55
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/218039
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed