RFR 8035735: Metaspace::contains become extremely slow in some cases

[Coleen Phillimore]

Summary: Call is_metadata instead which does less work for the call in 
debugInfo.hpp which is called for all compiled code stack frames.

open webrev at http://cr.openjdk.java.net/~coleenp/8035735/
bug link https://bugs.openjdk.java.net/browse/JDK-8035735

Tested with failing test case, nsk.quick.testlist, jcks and jtreg tests.

Coleen