Have one, long-lived map for bound functions.

tools/generate-runtime-tests.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import itertools
 import js2c
 import multiprocessing
 import optparse
 import os
@@ skipping 30 matching lines @@
 # that would provide:
 # ELEMENTS_KIND_CHECK_RUNTIME_FUNCTION
 # FIXED_TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 # TYPED_ARRAYS_CHECK_RUNTIME_FUNCTION
 
 # Counts of functions in each detection state. These are used to assert
 # that the parser doesn't bit-rot. Change the values as needed when you add,
 # remove or change runtime functions, but make sure we don't lose our ability
 # to parse them!
 EXPECTED_FUNCTION_COUNT = 358
-EXPECTED_FUZZABLE_COUNT = 325
+EXPECTED_FUZZABLE_COUNT = 326
 EXPECTED_CCTEST_COUNT = 6
-EXPECTED_UNKNOWN_COUNT = 5
+EXPECTED_UNKNOWN_COUNT = 4
 EXPECTED_BUILTINS_COUNT = 798
 
 
 # Don't call these at all.
 BLACKLISTED = [
   "Abort",  # Kills the process.
   "AbortJS",  # Kills the process.
   "CompileForOnStackReplacement",  # Riddled with ASSERTs.
   "IS_VAR",  # Not implemented in the runtime.
   "ListNatives",  # Not available in Release mode.
@@ skipping 72 matching lines @@
   "BreakIteratorFirst": [_BREAK_ITERATOR, None],
   "BreakIteratorNext": [_BREAK_ITERATOR, None],
   "CompileString": [None, "false", None],
   "CreateBreakIterator": ["'en-US'", "{type: 'string'}", None, None],
   "CreateJSFunctionProxy": [None, "function() {}", None, None, None],
   "CreatePrivateSymbol": ["\"foo\"", None],
   "CreateSymbol": ["\"foo\"", None],
   "DateParseString": [None, "new Array(8)", None],
   "DefineOrRedefineAccessorProperty": [None, None, "function() {}",
                                        "function() {}", 2, None],
+  "FunctionBindArguments": [None, None, "undefined", None, None],
   "GetBreakLocations": [None, 0, None],
   "GetDefaultReceiver": ["function() {}", None],
   "GetImplFromInitializedIntlObject": ["new Intl.NumberFormat('en-US')", None],
   "InternalCompare": [_COLLATOR, None, None, None],
   "InternalDateFormat": [_DATETIME_FORMAT, None, None],
   "InternalDateParse": [_DATETIME_FORMAT, None, None],
   "InternalNumberFormat": [_NUMBER_FORMAT, None, None],
   "InternalNumberParse": [_NUMBER_FORMAT, None, None],
   "IsSloppyModeFunction": ["function() {}", None],
   "LoadMutableDouble": ["{foo: 1.2}", None, None],
@@ skipping 1157 matching lines @@
       for i in range(len(processes)):
         processes[i].join()
     except KeyboardInterrupt:
       stop_running.set()
       for i in range(len(processes)):
         processes[i].join()
     return 0
 
 if __name__ == "__main__":
   sys.exit(Main())