Putting SloppyBlockFunctionStatement into local_zone_ was too early. It
needs to go into parser_zone_ because Scope refers to it. It will be
moved back to local_zone_ when we can put Scopes into temporary Zones.

A test (to demonstrate we crash without this CL) will follow in a separate CL.

R=verwaest@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2170813002
Cr-Commit-Position: refs/heads/master@{#37920}