tree beefca8286b7e346b78cb7ab5e54cc7a543c8d14
parent 41b15f9f06c7e2e5aac13f709c66412e6c299b67
author Mathieu Chartier <mathieuc@google.com> 1425684514 -0800
committer Mathieu Chartier <mathieuc@google.com> 1425689164 -0800

Only allocate collectors if we may use them

I believe most of the savings come from not allocating the concurrent
copying 8MB MarkQueue.

Before AOSP hh native PSS:
    72653 kB: Native
    72998 kB: Native
    72882 kB: Native

After AOSP hh native PSS:
    64823 kB: Native
    65986 kB: Native
    64219 kB: Native

Bug: 17643507
Change-Id: Ic5a8e753beca36142c1bf36be6311051f7c78e47