src: convert BE-utf16-string to LE before search
src: convert BE-utf16-string to LE before search

On Big Endian platforms v8 strings are need to converted
to Little Endian before searching in utf16le buffer

Fixes: https://github.com/nodejs/node/issues/3283
Reviewed-By: James M Snell <2d64a127ffc94dbe6295928a16bedf8b26814159@gmail.com>
Reviewed-By: Trevor Norris <9cb5491eb5770dd8e0bf77a8a0335abf5f0488c5@gmail.com>
Reviewed-By: Michael Dawson <23a83371479d56fe6796b2b4db62e2080dbb806e@ca.ibm.com>
PR-URL: https://github.com/nodejs/node/pull/3295

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