[8u20] RFR (S): 8029381 : assert(is_method_type()) failed: bad cast

[David Chase]

bug: https://bugs.openjdk.java.net/browse/JDK-8029381
webrev: http://cr.openjdk.java.net/~drchase/8029381/webrev.01/

Backport; bug is present in 8, causes same rare failures there.
This fixes a race condition in access to method_type and appendix from
constant pool cache while processing concurrent invokedynamic instructions
that provoke classloading, so it usually appears in the various Streams tests.

Testing for 8u -- it compiled.  This does not appear to have caused problems
in jdk9, but that only pushed on Monday (3 days ago).



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