Reland: "Use stability to only conditionally flush information from the CheckMaps table."

BUG=
R=ishell@chromium.org

Original CL: https://codereview.chromium.org/153823003

Review URL: https://codereview.chromium.org/153653007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19342 ce2b1a6d-e550-0410-aec6-3dcde31c8c00