Simplify and correctify pending message location handling.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 2126 matching lines @@
   }
   ResetInternal();
 }
 
 
 void v8::TryCatch::ResetInternal() {
   i::Object* the_hole = isolate_->heap()->the_hole_value();
   exception_ = the_hole;
   message_obj_ = the_hole;
   message_script_ = the_hole;
-  message_start_pos_ = 0;
-  message_end_pos_ = 0;
 }
 
 
 void v8::TryCatch::SetVerbose(bool value) {
   is_verbose_ = value;
 }
 
 
 void v8::TryCatch::SetCaptureMessage(bool value) {
   capture_message_ = value;
@@ skipping 5832 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal