Oilpan: when snapshotting type-specific pages use GCInfo of the page.
Oilpan: when snapshotting type-specific pages use GCInfo of the page.

R=ager@chromium.org
BUG=

Review URL: https://codereview.chromium.org/477913002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180358 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs