[builtins] Drop useless ToBoolean JavaScript builtin.

src/macros.py

Index: src/macros.py
diff --git a/src/macros.py b/src/macros.py
index 7f614167b4157bdf03421059656d96cce9f32fdc..ada0733a150abd2e5b906a6c61374d08bcc9081c 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -141,10 +141,11 @@ 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));
 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_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));