These macro operators represent a conditional eager deoptimization exit
without explicit branching, which greatly reduces overhead of both
scheduling and register allocation, and thereby greatly reduces overall
compilation time, esp. when there are a lot of eager deoptimization
exits.

R=jarin@chromium.org

Review URL: https://codereview.chromium.org/1721103003

Cr-Commit-Position: refs/heads/master@{#34239}