port ab840259 (r31790).

  original commit message:
  The current implementation of classes throws the TypeError at the wrong
  point, after activating a new context when directly calling a class
  constructor. According to the spec, the TypeError has to be thrown
  in the caller context.

BUG=

Review URL: https://codereview.chromium.org/1419793007

Cr-Commit-Position: refs/heads/master@{#31815}