Remove "is function lazy" logic from Preparser + tiny error reporting refactoring.

src/parsing/preparse-data.h

 // Copyright 2011 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.
 
 #ifndef V8_PARSING_PREPARSE_DATA_H_
 #define V8_PARSING_PREPARSE_DATA_H_
 
 #include "src/allocation.h"
 #include "src/base/hashmap.h"
 #include "src/collector.h"
@@ skipping 63 matching lines @@
   SingletonLogger()
       : has_error_(false), start_(-1), end_(-1), error_type_(kSyntaxError) {}
   virtual ~SingletonLogger() {}
 
   void Reset() { has_error_ = false; }
 
   virtual void LogFunction(int start, int end, int literals, int properties,
                            LanguageMode language_mode, bool uses_super_property,
                            bool calls_eval) {
     DCHECK(!has_error_);
+    // Check that we only log at most one function.
+    DCHECK(start_ == -1 && end_ == -1);
     start_ = start;
     end_ = end;
     literals_ = literals;
     properties_ = properties;
     language_mode_ = language_mode;
     uses_super_property_ = uses_super_property;
     calls_eval_ = calls_eval;
   }
 
   // Logs an error message and marks the log as containing an error.
@@ skipping 110 matching lines @@
 #ifdef DEBUG
   int prev_start_;
 #endif
 };
 
 
 }  // namespace internal
 }  // namespace v8.
 
 #endif  // V8_PARSING_PREPARSE_DATA_H_