fix incorrect module lookup on asan events; fix bad string size assumption with const string eval

src/dbg_engine/dbg_engine_ctrl.c

@@ -3031,15 +3031,7 @@ d_ctrl_thread__next_dmn_event(Arena *arena, DMN_CtrlCtx *ctrl_ctx, D_Msg *msg, D
               Access *access = access_open();
               D_Handle process_handle = d_handle_from_dmn(D_MachineID_Local, ev->process);
               D_Entity *process = d_entity_from_handle(process_handle);
-              D_Entity *module = &d_entity_nil;
-              for(D_Entity *child = process->first; child != &d_entity_nil; child = child->next)
-              {
-                if(child->kind == D_EntityKind_Module)
-                {
-                  module = child;
-                  break;
-                }
-              }
+              D_Entity *module = d_module_from_process_vaddr(process, ev->instruction_pointer);
               if(module != &d_entity_nil)
               {
                 // rjf: determine base address of asan shadow space

src/eval/eval_interpret.c

@@ -402,8 +402,10 @@ e_interpret(String8 bytecode)
       
       case RDI_EvalOp_ConstString:
       {
-        MemoryCopy(&nval, ptr, imm.u64);
-        ptr += imm.u64;
+        U64 src_size = imm.u64;
+        U64 dst_size = Min(sizeof(nval), src_size);
+        MemoryCopy(&nval, ptr, dst_size);
+        ptr += src_size;
       }break;
       
       case RDI_EvalOp_Abs: