-Wsuggest-final-types crashes when used on mininal testcases.
Fix by bailing out early when odr_types_ptr is NULL in ipa_devirt()

2014-09-19  Markus Trippelsdorf  <markus@trippelsdorf.de>

        PR ipa/61998
        * ipa-devirt.c (ipa_devirt): Bail out if odr_types_ptr is NULL.

2014-09-19  Markus Trippelsdorf  <markus@trippelsdorf.de>

        PR ipa/61998
        * g++.dg/warn/Wsuggest-final-2.C: New testcase.

From-SVN: r215392