Add Verdi option and memory preloading for VCS simulator
Created by: Gchauvon
Hello,
I added some support for vcs :
- moved vcs work files to a work directory.
- added debug options to vcs compilation to use VERDI.
- enable preloading for vcs and disable debug because it was reloading memory.
- made explicit the connection for critical_word in miss_handler, it was raising an error for vcs when using 32bit configuration.
Memory preloading makes simulation faster.