Fix issue 86 by keeping track of the fact that finally blocks

Fix issue 86 by keeping track of the fact that finally blocks
are evaluated with an extra element on the stack, which needs
to be taken into account when breaking and continuing.

I'll clean up the code and add an abstraction for manipulating
the break stack height in a future CL -- I want to try to get
rid of the separate local variable we keep around for the "state"
when running in a finally block.
Review URL: http://codereview.chromium.org/5625

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00