tools: remove unused GuessWordSize function
tools: remove unused GuessWordSize function

Apart from the fact that the implementation is not reliable,
GuessWordSize is not used anywhere in the codebase.

PR-URL: https://github.com/iojs/io.js/pull/1638
Reviewed-By: Roman Reiss <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@silverwind.io>
Reviewed-By: Jeremiah Senkpiel <f1782d15e31ad502ea2c097c21cc235811d0cb7c@rocketmail.com>

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