Scripts to run imperas

Created by: rosethompson

• Fixed issue with rvvi tracer so it reports call csr changes, not just instrutions which write the CSRs.
• Found a potential issue with mstatush when XLEN = 64.
• Code refactor and addition of rvvi interface
• refactor all rvvi into single initial block
• Fixed the rvvi CSR write enable not synchronized with a valid instruction in the Writeback stage.
• update for private copy of Imperas
• ignore external
• refer to correct path
• remove volatile for FFLAGS and FCSR
• add im flags for compressed disass
• changes made with Ross
• Partial fix for misaligned LD/ST
• Modified to clone imperas via git rather than https.
• customer commands
• correct the HASH
• update
• Imperas found a bug with the Fence.I instruction. If a fence.i directly followed a store miss, the d$ would release Stall during the cache line write. Then transition to ReadHold. This cause the d$ flush to go high while in ReadHold. The solution is to ensure the cache continues to assert Stall while in WriteLine state.
• Minor gshare optimization.
• Simplified gshare.
• Major cleanup of branch predictor.
• Improved signal names.
• More branch predictor cleanup.
• Parameterized testbench branch predictor preload.
• Fixed parameterization in testbench.
• Found small bug in gshare.
• Renamed signals in RAS.
• Minor bug fix in gshare.
• Fixed remaining bugs in the imperas merge.
• Created scripts to install imperas and run a single test using imperas.