Experimental parser: remove bom handling

src/scanner.h

 // 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 121 matching lines @@
   typedef unibrow::Utf8Decoder<512> Utf8Decoder;
 
   StaticResource<Utf8Decoder>* utf8_decoder() {
     return &utf8_decoder_;
   }
 
   bool IsIdentifierStart(unibrow::uchar c) { return kIsIdentifierStart.get(c); }
   bool IsIdentifierPart(unibrow::uchar c) { return kIsIdentifierPart.get(c); }
   bool IsLineTerminator(unibrow::uchar c) { return kIsLineTerminator.get(c); }
   bool IsWhiteSpace(unibrow::uchar c) { return kIsWhiteSpace.get(c); }
+  bool IsByteOrderMark(unibrow::uchar c) { return c == 0xfffe || c == 0xfeff; }
   bool IsWhiteSpaceNotLineTerminator(unibrow::uchar c) {
-    return !kIsLineTerminator.get(c) && kIsWhiteSpace.get(c);
+    return (kIsWhiteSpace.get(c) && !kIsLineTerminator.get(c)) ||
+        IsByteOrderMark(c);
   }
   bool IsLetter(unibrow::uchar c) { return kIsLetter.get(c); }
   bool IsIdentifierPartNotLetter(unibrow::uchar c) {
     return kIsIdentifierPartNotLetter.get(c);
   }
 
  private:
   unibrow::Predicate<IdentifierStart, 128> kIsIdentifierStart;
   unibrow::Predicate<IdentifierPart, 128> kIsIdentifierPart;
   unibrow::Predicate<unibrow::LineTerminator, 128> kIsLineTerminator;
@@ skipping 470 matching lines @@
   bool harmony_scoping_;
   // Whether we scan 'module', 'import', 'export' as keywords.
   bool harmony_modules_;
   // Whether we scan 0o777 and 0b111 as numbers.
   bool harmony_numeric_literals_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_