In reporting step-in positions be more accurate with a position the debugger paused at

src/debug.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 385 matching lines @@
     ClearDebugBreakAtSlot();
   } else {
     // Patch the IC call.
     ClearDebugBreakAtIC();
   }
   ASSERT(!IsDebugBreak());
 }
 
 
 bool BreakLocationIterator::IsStepInLocation(Isolate* isolate) {
-  if (RelocInfo::IsConstructCall(rmode())) {
+  if (RelocInfo::IsConstructCall(original_rmode())) {
     return true;
   } else if (RelocInfo::IsCodeTarget(rmode())) {
     HandleScope scope(debug_info_->GetIsolate());
-    Address target = rinfo()->target_address();
+    Address target = original_rinfo()->target_address();
     Handle<Code> target_code(Code::GetCodeFromTargetAddress(target));
     if (target_code->kind() == Code::STUB) {
       return target_code->major_key() == CodeStub::CallFunction;
     }
     return target_code->is_call_stub() || target_code->is_keyed_call_stub();
   } else {
     return false;
   }
 }
 
@@ skipping 3433 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal