Consolidated SRAMs and removed unused versions
Created by: rosethompson
- Moved branch predictor files into separate sub-directory.
- Partial BTB cleanup.
- Moved and ranamed btb to btb.sv Fixed btb to use the fixed port 2 sram.
- Removed the old two port ram and replaced it with the fixed version. The fixed version is renamed to ram2p1r1wb.sv
- Removed old versions of gshare.