RFR (S) JDK-8216970: condy causes JVM crash

[Lois Foltan]

Please review this change that allows escape analysis to correctly 
handle a dynamic constant whose return type is an array.

open webrev at: http://cr.openjdk.java.net/~lfoltan/bug_jdk8216970.1/webrev/
bug link: https://bugs.openjdk.java.net/browse/JDK-8216970

Testing: hs-tier1-3, jdk-tier1-3 (all platforms).  hs-tier4-5 (linux only)

Thanks,
Lois