Remove old guard for lowp bilerp stage
Remove old guard for lowp bilerp stage

Change-Id: I8137b18e7dec421e30b7e6ead13fe1650cbc32d0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/568276
Reviewed-by: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>
Commit-Queue: Brian Osman <794c0b5534edf5601d88e1d41975d0262da12894@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia