[builtins] Drop useless ToBoolean JavaScript builtin.

src/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 123 matching lines @@
 macro CHECK_OBJECT_COERCIBLE(arg, functionName) = if (IS_NULL(%IS_VAR(arg)) || IS_UNDEFINED(arg)) throw MakeTypeError(kCalledOnNullOrUndefined, functionName);
 
 # Indices in bound function info retrieved by %BoundFunctionGetBindings(...).
 define kBoundFunctionIndex = 0;
 define kBoundThisIndex = 1;
 define kBoundArgumentsStartIndex = 2;
 
 # Inline macros. Use %IS_VAR to make sure arg is evaluated only once.
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro NUMBER_IS_FINITE(arg) = (%_IsSmi(%IS_VAR(arg)) || ((arg == arg) && (arg != 1/0) && (arg != -1/0)));
+macro TO_BOOLEAN(arg) = (!!arg);

[Toon Verwaest, 2015/10/08 08:56:56]

what if arg is 1 + "test"?

[Benedikt Meurer, 2015/10/08 08:58:00]

Done.

 macro TO_INTEGER(arg) = (%_ToInteger(arg));
 macro TO_INTEGER_MAP_MINUS_ZERO(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToIntegerMapMinusZero(arg));
 macro TO_INT32(arg) = (arg | 0);
 macro TO_UINT32(arg) = (arg >>> 0);
 macro TO_LENGTH(arg) = (%ToLength(arg));
 macro TO_LENGTH_OR_UINT32(arg) = (harmony_tolength ? TO_LENGTH(arg) : TO_UINT32(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));
@@ skipping 149 matching lines @@
 define NOT_FOUND = -1;
 
 # Check whether debug is active.
 define DEBUG_IS_ACTIVE = (%_DebugIsActive() != 0);
 macro DEBUG_IS_STEPPING(function) = (%_DebugIsActive() != 0 && %DebugCallbackSupportsStepping(function));
 macro DEBUG_PREPARE_STEP_IN_IF_STEPPING(function) = if (DEBUG_IS_STEPPING(function)) %DebugPrepareStepInIfStepping(function);
 
 # SharedFlag equivalents
 define kNotShared = false;
 define kShared = true;