src: internalize binding function property names
src: internalize binding function property names

Internalized strings are created in the old space and that is where they
eventually would end up anyway when created as normal strings.

PR-URL: https://github.com/nodejs/node/pull/3060
Reviewed-By: James M Snell <2d64a127ffc94dbe6295928a16bedf8b26814159@gmail.com>
Reviewed-By: Trevor Norris <9cb5491eb5770dd8e0bf77a8a0335abf5f0488c5@gmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node