cbo optimizations

Created by: rosethompson

• Fixed subtle bug in the embench makefile if the sim/wkdir directory did not exist.
• Fixed repeatability issues with the branch predictor simulator results generation. I reran using a clean clone of the repo so this should be working now.
• Added files to ignore file.
• Changes to support concurrent simulation of all the branch predictor sweeps.
• Fixed subtle bug in branch prediction post processing script.
• Last little hickups out of the branch predictor results parsing.
• Fixed bug in the wally do script.
• Sutble bug in the cacheway logic for cacheline invalidation.
• Clarified names in cacheway.
• Reduced cache fsm complexity.
• More cache simplifications.
• Modified the pmachecker to correctly check the permissions for cmo instructions. However this isn't fully tested.
• Added correct cbo fault behavior.
• Extended the abhcacheinterface to zero a cacheline's worth of uncached memory on cbo.zero.
• Fixed minor bug in the cbo hazard logic.
• Renamed signal in pmachecker.
• Oups. Introduced undetected bug into the cache's cbo insructions.