demon/win32: roll back on all hit traps, even if explicit. the previous implementation would silently skip threads past explicit traps that they hit, as a way of implicitly storing the fact that trap exceptions had been reported, and the user could continue past them. this resulted in incorrect instruction pointer display in those circumstances. this change adjusts this, so that after a trap exception of any kind, the instruction pointer is ALWAYS rolled back. to ensure that the trap is not repeatedly hit, if the associated exception has already been reported, to allow the user to e.g. step over traps (this is the behavior of Visual Studio), additional state is stored per-thread-entity, which allows a subsequent demon_os_run to adjust RIPs past their previously reported traps before running again.

src/ctrl/ctrl_core.c

@@ -767,7 +767,9 @@ ctrl_process_write(CTRL_MachineID machine_id, CTRL_Handle process, Rng1U64 range
     ins_atomic_u64_inc_eval(&ctrl_state->memgen_idx);
   }
   
-  //- rjf: success -> forcibly, synchronously update cache, for small regions
+  //- rjf: success -> wait for cache updates, for small regions - prefer relatively seamless
+  // writes within calling frame's "view" of the memory, at the expense of a small amount of
+  // time.
   if(result)
   {
     Temp scratch = scratch_begin(0, 0);