Fix string whitespace trimming of byte order marks.

src/runtime.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 6096 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_StringToUpperCase) {
   return ConvertCase<ToUpperTraits>(
       args, isolate, isolate->runtime_state()->to_upper_mapping());
 }
 
 
 static inline bool IsTrimWhiteSpace(unibrow::uchar c) {
-  return unibrow::WhiteSpace::Is(c) || c == 0x200b;
+  return unibrow::WhiteSpace::Is(c) || c == 0x200b || c == 0xfeff;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_StringTrim) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 3);
 
   CONVERT_CHECKED(String, s, args[0]);
   CONVERT_BOOLEAN_CHECKED(trimLeft, args[1]);
   CONVERT_BOOLEAN_CHECKED(trimRight, args[2]);
@@ skipping 7115 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags);
   }
 }
 
 
 } }  // namespace v8::internal