Avoid scan-on-scavenge pages during full collection.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/372193002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22267 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
--trace-ic: much faster and available in Release mode.

Also add IC tracing to a path where it was missing.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/368833003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22268 ce2b1a6d-e550-0410-aec6-3dcde31c8c00