Fix step in positions (include various calls and exclude current pc point), add a test

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 392 matching lines @@
 }
 
 
 bool BreakLocationIterator::IsStepInLocation(Isolate* isolate) {
   if (RelocInfo::IsConstructCall(rmode())) {
     return true;
   } else if (RelocInfo::IsCodeTarget(rmode())) {
     HandleScope scope(debug_info_->GetIsolate());
     Address target = 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;
   }
 }
 
 
 void BreakLocationIterator::PrepareStepIn(Isolate* isolate) {
   HandleScope scope(isolate);
 
@@ skipping 3436 matching lines @@
     {
       Locker locker(reinterpret_cast<v8::Isolate*>(isolate_));
       isolate_->debugger()->CallMessageDispatchHandler();
     }
   }
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal