[8u] backport of 8075587: Compilation of constant array containing different sub classes crashes the JVM

[Roland Westrelin]

8u backport request. 8075587 was pushed to jdk9 1 week ago and it hasn’t caused any new failures during nightly testing. The
change applies cleanly to 8u (identical change with an offset of -133 lines in file type.cpp).

https://bugs.openjdk.java.net/browse/JDK-8075587
http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/215053fb9d59

Roland.