In particular the Babel generated code for simple constructors is
of interest here, since that's what we hit in the wild most often
currently.

BUG=v8:6275
R=yangguo@chromium.org

Review-Url: https://codereview.chromium.org/2822203004
Cr-Commit-Position: refs/heads/master@{#44719}

BUG=v8:5922

Review-Url: https://codereview.chromium.org/2674873002
Cr-Commit-Position: refs/heads/master@{#42954}

BUG=v8:5922

Review-Url: https://codereview.chromium.org/2669223002
Cr-Commit-Position: refs/heads/master@{#42929}