support perfcct

[tastynoob]

No description provided.

[poemonsense]

1. Please format the commit title, commit message, and code

2. Will ChiselDB always generate perfCCT.cpp? If not, please use another macro specifically for perfCCT.cpp.

3. The main.cpp currently only applies to Verilator. Should we support perfCCT.cpp in VCS?

[tastynoob]

1. Please format the commit title, commit message, and code
2. Will ChiselDB always generate perfCCT.cpp? If not, please use another macro specifically for perfCCT.cpp.
3. The main.cpp currently only applies to Verilator. Should we support perfCCT.cpp in VCS?

2: yes, perfCCT reuse chiselDB init function
3: yes, need some time

[tastynoob]

remove global_sim_tick from main.cpp, use verilog dpic function update tick per cycle

[poemonsense]

As I still doubt the necessity of introducing perfCCT.cpp in ChiselDB, which is expected to create only chisel_db.cpp, the approval of this PR will depend on the approval and merging of OpenXiangShan/Utility#88. Please first consult the maintainers of ChiselDB before changing the ChiselDB C++ APIs in difftest. Thank you