move interactive function init out of main loop

These values don't change between runs, so there's no point in recreating
them on every instruction step.  Pull it out to the top to simplify.

riscv/interactive.cc

@@ -48,6 +48,20 @@ static std::string readline(int fd)
 
 void sim_t::interactive()
 {
+  typedef void (sim_t::*interactive_func)(const std::string&, const std::vector<std::string>&);
+  std::map<std::string,interactive_func> funcs;
+
+  funcs["r"] = &sim_t::interactive_run_noisy;
+  funcs["rs"] = &sim_t::interactive_run_silent;
+  funcs["reg"] = &sim_t::interactive_reg;
+  funcs["fregs"] = &sim_t::interactive_fregs;
+  funcs["fregd"] = &sim_t::interactive_fregd;
+  funcs["mem"] = &sim_t::interactive_mem;
+  funcs["str"] = &sim_t::interactive_str;
+  funcs["until"] = &sim_t::interactive_until;
+  funcs["while"] = &sim_t::interactive_until;
+  funcs["q"] = &sim_t::interactive_quit;
+
   while (!htif->done())
   {
     std::cerr << ": " << std::flush;
@@ -67,20 +81,6 @@ void sim_t::interactive()
     while (ss >> tmp)
       args.push_back(tmp);
 
-    typedef void (sim_t::*interactive_func)(const std::string&, const std::vector<std::string>&);
-    std::map<std::string,interactive_func> funcs;
-
-    funcs["r"] = &sim_t::interactive_run_noisy;
-    funcs["rs"] = &sim_t::interactive_run_silent;
-    funcs["reg"] = &sim_t::interactive_reg;
-    funcs["fregs"] = &sim_t::interactive_fregs;
-    funcs["fregd"] = &sim_t::interactive_fregd;
-    funcs["mem"] = &sim_t::interactive_mem;
-    funcs["str"] = &sim_t::interactive_str;
-    funcs["until"] = &sim_t::interactive_until;
-    funcs["while"] = &sim_t::interactive_until;
-    funcs["q"] = &sim_t::interactive_quit;
-
     try
     {
       if(funcs.count(cmd))