py/objtype: Use CPython compatible method name for sizeof.

Paul Sokolovsky · Paul Sokolovsky · commit f2baa9ec245a · 2017-10-19T12:44:53.000+03:00
Per https://docs.python.org/3/library/sys.html#sys.getsizeof: getsizeof() calls the object’s __sizeof__ method. Previously, "getsizeof" was used mostly to save on new qstr, as we don't really support calling this method on arbitrary objects (so it was used only for reporting). However, normalize it all now.
diff --git a/py/objtype.c b/py/objtype.c
@@ -342,7 +342,7 @@ const uint16_t mp_unary_op_method_name[MP_UNARY_OP_NUM_RUNTIME] = {
     [MP_UNARY_OP_INVERT] = MP_QSTR___invert__,
     #endif
     #if MICROPY_PY_SYS_GETSIZEOF
-    [MP_UNARY_OP_SIZEOF] = MP_QSTR_getsizeof,
+    [MP_UNARY_OP_SIZEOF] = MP_QSTR___sizeof__,
     #endif
 };
 
