[aarch64-port-dev ] RFR: 8156943: aarch64: string compare does not support CompactStrings

[Edward Nevill]

Hi,

Please review the following webrev

http://cr.openjdk.java.net/~enevill/8156943/webrev.01/

This adds support for LL, LU and UL encodings of StrComp

Tested with fastdebug build on jtreg hotspot & langtools.

Regards,
Ed.