New gshare implementation

Created by: rosethompson

• keep this commit off of cvw.
• dc shell setup.
• Fixed bug with branch predictor.
• Fixed a branch predictor performance issue.
• Updated global history predictor.
• More updates.
• Fixed global history predictor.
• Renamed globalhistory predictor.
• Minor fix.
• Possibly much better branch predictor implemention. The complexity is significantly reduced.
• Simplified branch predictor.