[cleanup] Inline HAS_INDEX macro as it's trivially the 'in' operator

src/js/macros.py

Index: src/js/macros.py
diff --git a/src/js/macros.py b/src/js/macros.py
index a82539a73c57dfdd3858d610e7362cf49f07f6e2..c6ed019dd645d4193ce0786d0a187432c6bf27ec 100644
--- a/src/js/macros.py
+++ b/src/js/macros.py
@@ -123,7 +123,6 @@ 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) = (index in array);
 
 # Private names.
 macro IS_PRIVATE(sym) = (%SymbolIsPrivate(sym));