* Alternative plan: use async vaddr module

* It should have no side effect

* should be compatible with single core difftest framework

Now, it can compile.

When sbuffer checks if it is empty, it needs to check if sq is also empty
so there is no pending store. Errors will emerge rarely if we do not
check sq.

* values of hardware performance counters can hardly be emulated by NEMU

Now storequeue dataModule is divided into 3 modules:
* vaddrModule (2w1r)
* exceptionModule (2w1r)
* dataModule (core data module, 2w2r+fwd)