[es6] Introduce %ToInteger and %ToLength.

src/macros.py

Index: src/macros.py
diff --git a/src/macros.py b/src/macros.py
index f3b646b3d94e5f11c6d02d287ff996fe36bf1994..6de9120fb29edc740d3f21b21f1b204cb6c4c824 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -141,12 +141,12 @@ 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_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToInteger(ToNumber(arg)));
-macro TO_INTEGER_FOR_SIDE_EFFECT(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : ToNumber(arg));
+macro TO_INTEGER(arg) = (%_ToInteger(arg));
 macro TO_INTEGER_MAP_MINUS_ZERO(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : %NumberToIntegerMapMinusZero(ToNumber(arg)));
 macro TO_INT32(arg) = (arg | 0);
 macro TO_UINT32(arg) = (arg >>> 0);
-macro TO_LENGTH_OR_UINT32(arg) = (harmony_tolength ? $toLength(arg) : TO_UINT32(arg));
+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_INLINE(arg) = (IS_NUMBER(%IS_VAR(arg)) ? arg : $nonNumberToNumber(arg));
 macro TO_OBJECT(arg) = (%_ToObject(arg));