[array] speed up array.forEach and friends by directly using in-operator

src/js/macros.py

 # Copyright 2006-2009 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 106 matching lines @@
 macro TO_LENGTH(arg) = (%_ToLength(arg));
 macro TO_STRING(arg) = (%_ToString(arg));
 macro TO_NUMBER(arg) = (%_ToNumber(arg));
 macro TO_OBJECT(arg) = (%_ToObject(arg));
 macro TO_PRIMITIVE(arg) = (%_ToPrimitive(arg));
 macro TO_PRIMITIVE_NUMBER(arg) = (%_ToPrimitive_Number(arg));
 macro TO_PRIMITIVE_STRING(arg) = (%_ToPrimitive_String(arg));
 macro TO_NAME(arg) = (%_ToName(arg));
 macro JSON_NUMBER_TO_STRING(arg) = ((%_IsSmi(%IS_VAR(arg)) || arg - arg == 0) ? %_NumberToString(arg) : "null");
 macro HAS_OWN_PROPERTY(obj, key) = (%_Call(ObjectHasOwnProperty, obj, key));
-macro HAS_INDEX(array, index, is_array) = ((is_array && %_HasFastPackedElements(%IS_VAR(array)) && (index < array.length)) ||  (index in array));
+macro HAS_INDEX(array, index) = (index in array);
 
 # Private names.
 macro IS_PRIVATE(sym) = (%SymbolIsPrivate(sym));
 macro HAS_PRIVATE(obj, key) = HAS_OWN_PROPERTY(obj, key);
 macro HAS_DEFINED_PRIVATE(obj, sym) = (!IS_UNDEFINED(obj[sym]));
 macro GET_PRIVATE(obj, sym) = (obj[sym]);
 macro SET_PRIVATE(obj, sym, val) = (obj[sym] = val);
 
 # Constants.  The compiler constant folds them.
 define INFINITY = (1/0);
@@ skipping 120 matching lines @@
 define kSloppyModeBlockScopedFunctionRedefinition = 22;
 define kForInInitializer = 23;
 define kArrayProtectorDirtied = 24;
 define kArraySpeciesModified = 25;
 define kArrayPrototypeConstructorModified = 26;
 define kArrayInstanceProtoModified = 27;
 define kArrayInstanceConstructorModified = 28;
 define kLegacyFunctionDeclaration = 29;
 define kRegExpPrototypeSourceGetter = 30;
 define kRegExpPrototypeOldFlagGetter = 31;