object.h special-build macro minefield: renamed all the new lexical

helper macros to something saner, and used them appropriately in other
files too, to reduce #ifdef blocks.

classobject.c, instance_dealloc():  One of my worst Python Memories is
trying to fix this routine a few years ago when COUNT_ALLOCS was defined
but Py_TRACE_REFS wasn't.  The special-build code here is way too
complicated.  Now it's much simpler.  Difference:  in a Py_TRACE_REFS
build, the instance is no longer in the doubly-linked list of live
objects while its __del__ method is executing, and that may be visible
via sys.getobjects() called from a __del__ method.  Tough -- the object
is presumed dead while its __del__ is executing anyway, and not calling
_Py_NewReference() at the start allows enormous code simplification.

typeobject.c, call_finalizer():  The special-build instance_dealloc()
pain apparently spread to here too via cut-'n-paste, and this is much
simpler now too.  In addition, I didn't understand why this routine
was calling _PyObject_GC_TRACK() after a resurrection, since there's no
plausible way _PyObject_GC_UNTRACK() could have been called on the
object by this point.  I suspect it was left over from pasting the
instance_delloc() code.  Instead asserted that the object is still
tracked.  Caution:  I suspect we don't have a test that actually
exercises the subtype_dealloc() __del__-resurrected-me code.

Objects/stringobject.c

@@ -3060,9 +3060,7 @@ _PyString_Resize(PyObject **pv, int newsize)
 		return -1;
 	}
 	/* XXX UNREF/NEWREF interface should be more symmetrical */
-#ifdef Py_REF_DEBUG
-	--_Py_RefTotal;
-#endif
+	_Py_DEC_REFTOTAL;
 	_Py_ForgetReference(v);
 	*pv = (PyObject *)
 		PyObject_REALLOC((char *)v,