[8u40] RFR: 8042235: redefining method used by multiple MethodHandles crashes VM

[Coleen Phillimore]

This is a backport of the bug fix for bug 
*https://bugs.openjdk.java.net/browse/JDK-8042593

*The fix has been in JDK9 for a week with a couple of nights of 
successful testing.  The patch applied cleanly to jdk8u40.

http://cr.openjdk.java.net/~coleenp/8042235_8u40/

Please approve this backport.

thanks,
Coleen