Create IS_SPEC_OBJECT macro to simplify javescript code....

src/macros.py

Index: src/macros.py
===================================================================
--- src/macros.py	(revision 4624)
+++ src/macros.py	(working copy)
@@ -112,6 +112,11 @@
 macro IS_UNDETECTABLE(arg)      = (%_IsUndetectableObject(arg));
 macro FLOOR(arg)                = $floor(arg);
 
+# Macro for ECMAScript 5 queries of the type:
+# "Type(O) is object."
+# This is the same as being either a function or an object in V8 terminology.
+macro IS_SPEC_OBJECT_OR_NULL(arg) = (%_IsObject(arg) || %_IsFunction(arg));
+
 # 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 TO_INTEGER(arg) = (%_IsSmi(%IS_VAR(arg)) ? arg : ToInteger(arg));