RFR(L): 8008407: remove SPARC V8 support

[Morris Meyer]

Could I get a review for this issue?

This patch is based on work originally by Christian Thalinger with 
several chunks of V8 removal from me.  There are a few V8 instructions 
left - LDD, STD, CASA and a few others.  Follow on bugs will be assigned 
to rework each specific instruction.

These changes have been tested with the vm regression suite and JPRT.

Thanks in advance.

         --morris

WEBREV - http://cr.openjdk.java.net/~morris/8008407.01
BUG - https://jbs.oracle.com/bugs/browse/JDK-8008407