Remove (untested) code for unsupported compilers.

src/preparser.cc

 // 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.
 
 #include <cmath>
 
 #include "include/v8stdint.h"
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
 #include "src/globals.h"
 #include "src/hashmap.h"
 #include "src/list.h"
 #include "src/preparse-data.h"
 #include "src/preparse-data-format.h"
 #include "src/preparser.h"
 #include "src/unicode.h"
 #include "src/utils.h"
 
-#if V8_LIBC_MSVCRT && (_MSC_VER < 1800)
-namespace std {
-
-// Usually defined in math.h, but not in MSVC until VS2013+.
-// Abstracted to work
-int isfinite(double value);
-
-}  // namespace std
-#endif
-
 namespace v8 {
 namespace internal {
 
 void PreParserTraits::ReportMessageAt(Scanner::Location location,
                                       const char* message,
                                       const char* arg,
                                       bool is_reference_error) {
   ReportMessageAt(location.beg_pos,
                   location.end_pos,
                   message,
@@ skipping 904 matching lines @@
   ParseIdentifier(kAllowEvalOrArguments, CHECK_OK);
   ParseArguments(ok);
 
   return Expression::Default();
 }
 
 #undef CHECK_OK
 
 
 } }  // v8::internal