When inlining a function in a test context, it's possible that control
flow does not reach one or both of the branch targets.  In that case
we should not try to construct a flow graph from that target.

This bug has been fixed on the 3.4 branch and later, but was present
on 3.3 and earlier.

R=vegorov@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7739025

git-svn-id: http://v8.googlecode.com/svn/branches/3.3@9144 ce2b1a6d-e550-0410-aec6-3dcde31c8c00