Linux perf tool support update + refactoring.
This adds timestamps to allow profiling with code space reuse. Also a couple of updates to reflect the changes in the JIT perf interface + a move of the perf-related stuff into separate files.
Unfortunately, the change only works with the latest patch to the perf tool from a Linux perf tool contributor (Stephane Eranian).
BUG=
R=yangguo@chromium.org
Review URL: https://codereview.chromium.org/
255803003
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22098
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00