RFR(M): 8196786: [PPC64+s390] ConstantDynamic support

[Doerr, Martin]

Hi,

I've just implemented the template interpreter parts for ConstantDynamic support (jdk-8186046) on PPC64 and s390.

The following tests have passed on linux ppc64le + s390 and AIX:
test/jdk/java/lang/invoke/condy/

Please review:
http://cr.openjdk.java.net/~mdoerr/8196786_ppc64_s390_condy/webrev.00/

Best regards,
Martin