This works around the problem that the lowering for JSStackCheck doesn't
play well with effect chain based state tracking, because it doesn't
report the correct changes (we will address this with a better handling
of stack checks soon).

It also allows us to run the EarlyOptimizationPhase concurrently, which
doesn't need to access the heap or generate code stubs.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2183033002
Cr-Commit-Position: refs/heads/master@{#38049}