* This will also bump firrtl to 1.3.2. It seems that the performance of
  firrtl compile time is greatly improved. On 9700k, it is improved from
  218104.5 ms to 135609.5 ms.

CI: any pull request to master must pass cputest and riscv-tests

Xs trap: add custom trap instruction to make difftest happy

Brq v2: give priority to mispredicted inst

Makefile: support parallel build with emu

* Previously there is a cpp file called xxx__ALLcls.cpp, which includes
  nearly all other cpp files. Such a big cpp file will be compiled. And
  it can not leverage parallel jobs with Makefile.
* To enbale parallel build, we should pass VM_PARALLEL_BUILDS=1 to the
  Makefile to generate emu.

Fix mul/dispatch/lsu bugs, CoreMark passed

dispatch2,issuequeue: bug fix, cputest pass

brq: fix redirect head tail

Add mul div, fix lsu