RFR (S) 8180181: Get rid of FAST_DISPATCH from interpreter

[Mikael Gerdin]

Hi,

Please review this change to delete the FAST_DISPATCH support from the 
SPARC template interpreter. This code has been disabled for 15+ years:

# 1.103.3.4 22-Aug-2000 rasbold undef FAST_DISPATCH; fix merge boo-boos

I think it's safe to remove it now.
The FAST_DISPATCH code has also leaked into the s390 port with 
references to SPARC registers and all so that should go away as well.

I've ran it through JPRT on SPARC.

Webrev: http://cr.openjdk.java.net/~mgerdin/8180181/webrev.0/
Bug: https://bugs.openjdk.java.net/browse/JDK-8180181

Thanks
/Mikael