adds initial working version of llvm backend

src/iss/arch/riscv_hart_m_p.h

@@ -1113,8 +1113,10 @@ iss::status riscv_hart_m_p<BASE, FEAT>::write_mem(phys_addr_t paddr, unsigned le
                         }
                         this->reg.trap_state=std::numeric_limits<uint32_t>::max();
                         this->interrupt_sim=hostvar;
+#ifndef WITH_TCC
+                        throw(iss::simulation_stopped(hostvar));
+#endif
                         break;
-                        //throw(iss::simulation_stopped(hostvar));
                     case 0x0101: {
                         char c = static_cast<char>(hostvar & 0xff);
                         if (c == '\n' || c == 0) {