Merge "Revert "remove SK_SUPPORT_LEGACY_CLIP_REGIONOPS"" into master-skia

https://skia.googlesource.com/skia/+/a129dfef2aaab0b5995cdf1ab7b2cdd41c29cf72

Change-Id: Ie6d92e71d36d1a3bf547e6bb3dd671b0ac48f1d4