A sloppy mode eval call that establishes strict mode will leak that strictness
into the sloppy surrounding scope on recompile. This changes the structure
of the type feedback vector for the function and crashes follow.

The fix is straightforward.

BUG=491536, 503565
LOG=N

Review URL: https://codereview.chromium.org/1231343003

Cr-Commit-Position: refs/heads/master@{#29671}