RFR 8228596: Class redefinition fails when condy instructions are removed

[Harold Seigel]

Hi,

Please review this small JDK-14 fix for an issue with constant pool 
merging when redefining a class whose constant pool contains a constant 
dynamic entry.  The fix makes sure that the has_dynamic_constant flag 
gets copied properly to the merged constant pool.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/bug_8228596/webrev/index.html

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8228596

The fix was regression tested by running Mach5 tiers 1 and 2 tests and 
builds on Linux-x64, Solaris, Windows, and Mac OS X, by running Mach5 
tiers 3-5 tests on Linux-x64, and JCK lang and VM tests on Linux-x64.

Thanks, Harold