Fix the ChangeLowering to properly use ControlEffect nodes
to turn the control output of IfTrue nodes into an effect
input for the Load nodes, and to properly use Finish nodes
to ensure that allocation and store were both performed
prior to actually using the allocated heap number.
TEST=compiler-unittests
R=jarin@chromium.org
Review URL: https://codereview.chromium.org/479163002
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23149 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
d9fe1e71c3