Allow identifier code points from supplementary multilingual planes.

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 435 matching lines @@
     "src/bignum-dtoa.h",
     "src/bignum.cc",
     "src/bignum.h",
     "src/bootstrapper.cc",
     "src/bootstrapper.h",
     "src/builtins.cc",
     "src/builtins.h",
     "src/bytecodes-irregexp.h",
     "src/cached-powers.cc",
     "src/cached-powers.h",
+    "src/char-predicates.cc",
     "src/char-predicates-inl.h",
     "src/char-predicates.h",
     "src/checks.cc",
     "src/checks.h",
     "src/circular-queue-inl.h",
     "src/circular-queue.h",
     "src/code-factory.cc",
     "src/code-factory.h",
     "src/code-stubs.cc",
     "src/code-stubs.h",
@@ skipping 960 matching lines @@
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
 
   direct_dependent_configs = [ ":external_config" ]
 }
 
 }