Don't preparse large files to find boundaries of lazy functions.

test/cctest/test-parsing.cc

 // Copyright 2011 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 844 matching lines @@
     int length = i::OS::SNPrintF(program, "%s%s%s",
                                  source_data[i].outer_prefix,
                                  source_data[i].inner_source,
                                  source_data[i].outer_suffix);
     CHECK(length == kProgramSize);
 
     // Parse program source.
     i::Handle<i::String> source(
         FACTORY->NewStringFromAscii(i::CStrVector(program.start())));
     i::Handle<i::Script> script = FACTORY->NewScript(source);
-    i::Parser parser(script, false, NULL, NULL);
+    i::Parser parser(script, i::kAllowLazy | i::EXTENDED_MODE, NULL, NULL);
     i::CompilationInfo info(script);
     info.MarkAsGlobal();
     info.SetLanguageMode(source_data[i].language_mode);
     i::FunctionLiteral* function = parser.ParseProgram(&info);
     CHECK(function != NULL);
 
     // Check scope types and positions.
     i::Scope* scope = function->scope();
     CHECK(scope->is_global_scope());
     CHECK_EQ(scope->start_position(), 0);
     CHECK_EQ(scope->end_position(), kProgramSize);
     CHECK_EQ(scope->inner_scopes()->length(), 1);
 
     i::Scope* inner_scope = scope->inner_scopes()->at(0);
     CHECK_EQ(inner_scope->type(), source_data[i].scope_type);
     CHECK_EQ(inner_scope->start_position(), kPrefixLen);
     // The end position of a token is one position after the last
     // character belonging to that token.
     CHECK_EQ(inner_scope->end_position(), kPrefixLen + kInnerLen);
   }
 }