Always update deps after bottom-up mutators run.
Always update deps after bottom-up mutators run.

This fixes a bug where a split module could be reached by subsequent
mutator passes, but it is no longer in module group's list of modules.

Change-Id: I74c3d849ed2614dcdb6f54a6760122b933bb84c2

colincross/blueprint,google/blueprint,jgennis/blueprint,jgennis/blueprint,yuhangwang/blueprint,danw/blueprint,google/blueprint,yuhangwang/blueprint,colincross/blueprint,danw/blueprint,Tiger66639/blueprint,Tiger66639/blueprint