JDK10/RFR(M): 8181853: Remove use of 'v9_only()'

[Patric Hedlin]

Dear all,

I would like to ask for help to review the following change/update:

Issue:    https://bugs.openjdk.java.net/browse/JDK-8181853

Webrev:   http://cr.openjdk.java.net/~neliasso/phedlin/tr8181853/

Prerequisite: https://bugs.openjdk.java.net/browse/JDK-8172231


8181853: Remove use of 'v9_only()'

     After JDK-8172231 we will no longer identify SPARC V8 as a valid ISA,
     i.e. there is no need to distinguish between V8 and V9 instructions.


Testing:

     Mostly tested on JDK9 (jtreg/RBT/hotspot/tier0-comp).
     Testing on JDK10 (jtreg/RBT/hotspot/precheckin-comp).


Best regards,
Patric