Extract symbols from 64 bits images using a 32 bits build of the converter.
Extract symbols from 64 bits images using a 32 bits build of the converter.

It's not possible to load a 64 bits image from a 32 bits build of the converter when file system redirection is enabled. This CL disables file system redirection before opening images.

R=etienneb@chromium.org

Review URL: https://codereview.appspot.com/18150043

fwininger/ETW2CTF,fwininger/ETW2CTF,fwininger/ETW2CTF