Merge "Deduplicate simple roots in hprof." into nyc-dev
am: dc97e0498d

* commit 'dc97e0498dd1971afb02bdba80254b63f26aac24':
  Deduplicate simple roots in hprof.

Change-Id: I69f83f0fb341945e8e20897f7befd7d9fa0295c1