Allow overriding raster pipeline's CPU level via #define

This makes it easier to test specific instruction sets (eg, scalar mode)
without switching compilers (or editing the source code).

Change-Id: I9148d8bdc1bcd00e39d2ba52c9d65872d3d4d28f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/798202
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
1 file changed