SDK fixes

test/dart_codegen/expect/_internal/symbol.dart

 part of dart._internal;
  class Symbol implements core.Symbol {final String _name;
  static const String reservedWordRE = r'(?:assert|break|c(?:a(?:se|tch)|lass|on(?:st|tinue))|d(?:efault|o)|' r'e(?:lse|num|xtends)|f(?:alse|inal(?:ly)?|or)|i[fns]|n(?:ew|ull)|' r'ret(?:hrow|urn)|s(?:uper|witch)|t(?:h(?:is|row)|r(?:ue|y))|' r'v(?:ar|oid)|w(?:hile|ith))';
  static const String publicIdentifierRE = r'(?!' '$reservedWordRE' r'\b(?!\$))[a-zA-Z$][\w$]*';
  static const String identifierRE = r'(?!' '$reservedWordRE' r'\b(?!\$))[a-zA-Z$_][\w$]*';
  static const String operatorRE = r'(?:[\-+*/%&|^]|\[\]=?|==|~/?|<[<=]?|>[>=]?|unary-)';
  static final RegExp publicSymbolPattern = new RegExp('^(?:$operatorRE\$|$publicIdentifierRE(?:=?\$|[.](?!\$)))+?\$');
  static final RegExp symbolPattern = new RegExp('^(?:$operatorRE\$|$identifierRE(?:=?\$|[.](?!\$)))+?\$');
  external const Symbol(String name);
  const Symbol.unvalidated(this._name);
  Symbol.validated(String name) : this._name = validatePublicSymbol(name);
- bool operator ==(other) => other is Symbol && _name == other._name;
+ bool operator ==(Object other) => other is Symbol && _name == other._name;
  int get hashCode {
   const arbitraryPrime = 664597;
    return 0x1fffffff & (arbitraryPrime * _name.hashCode);
   }
  toString() => 'Symbol("$_name")';
  static String getName(Symbol symbol) => symbol._name;
  static String validatePublicSymbol(String name) {
   if (name.isEmpty || publicSymbolPattern.hasMatch(name)) return name;
    if (name.startsWith('_')) {
     throw new ArgumentError('"$name" is a private identifier');
     }
    throw new ArgumentError('"$name" is not a valid (qualified) symbol name');
   }
  static bool isValidSymbol(String name) {
   return (name.isEmpty || symbolPattern.hasMatch(name));
   }
 }