tree c1ce6f62f7051c2189803f3993eebd68d66511bb
parent be4213bded3c82684114828b04739ee75770dc2c
author bohanli <bohanli@google.com> 1601052723 -0700
committer Bohan Li <bohanli@google.com> 1602113015 +0000

Add functions to merge and split regions.

Change-Id: I39f17ab4c46be16ac9d900c4372ef34be29d912e