[regexp] allow loose matching for property names.

src/char-predicates.h

 // 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.
 
 #ifndef V8_CHAR_PREDICATES_H_
 #define V8_CHAR_PREDICATES_H_
 
 #include "src/unicode.h"
 
 namespace v8 {
 namespace internal {
 
 // Unicode character predicates as defined by ECMA-262, 3rd,
 // used for lexical analysis.
 
 inline int AsciiAlphaToLower(uc32 c);
 inline bool IsCarriageReturn(uc32 c);
 inline bool IsLineFeed(uc32 c);
 inline bool IsAsciiIdentifier(uc32 c);
 inline bool IsAlphaNumeric(uc32 c);
-inline bool IsAlpha(uc32 c);
 inline bool IsDecimalDigit(uc32 c);
 inline bool IsHexDigit(uc32 c);
 inline bool IsOctalDigit(uc32 c);
 inline bool IsBinaryDigit(uc32 c);
 inline bool IsRegExpWord(uc32 c);
 inline bool IsRegExpNewline(uc32 c);
 
 
 struct SupplementaryPlanes {
   static bool IsIDStart(uc32 c);
@@ skipping 45 matching lines @@
 struct WhiteSpaceOrLineTerminator {
   static inline bool Is(uc32 c) {
     return WhiteSpace::Is(c) || unibrow::LineTerminator::Is(c);
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CHAR_PREDICATES_H_