Implemented basic HiFive1-like platform with PLL,tracing etc.

riscv/src/iss/rv32gc.cpp

@@ -62,6 +62,7 @@ void rv32gc::reset(uint64_t address) {
     reg.NEXT_PC=reg.PC;
     reg.trap_state=0;
     reg.machine_state=0x0;
+    reg.icount=0;
 }
 
 uint8_t* rv32gc::get_regs_base_ptr(){

riscv/src/iss/rv64ia.cpp

@@ -63,6 +63,7 @@ void rv64ia::reset(uint64_t address) {
     reg.NEXT_PC = reg.PC;
     reg.trap_state = 0;
     reg.machine_state = 0x3;
+    reg.icount=0;
 }
 
 uint8_t *rv64ia::get_regs_base_ptr() { return reinterpret_cast<uint8_t *>(&reg); }