In order to print a nice failure message which matches the reality of
the asserted objects, use the real name of the called method or property
if it makes sense. When the assertion is on a derivative of a method or
property or when the real name isn't helpful for a failure message
(e.g. "ab" naming of common lines for diffs), keep using more
descriptive pseudo-method names.
Change-Id: I53fae276c57fe09fb43a58e77efd681b34b60eb7
398681f154