RFR(S): 8075587: Compilation of constant array containing different sub classes crashes the JVM

[Roland Westrelin]

http://cr.openjdk.java.net/~roland/8075587/webrev.00/

The bug was introduced by:

http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/rev/5231c2210388

which causes the meet of 2 constant arrays to result in an array of elements of type bottom.

Roland.