Request for reviews (XS): 6831323: Use v8plus as minimum required hardware for current Hotspot sources

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6831323/webrev.00

Fixed 6831323: Use v8plus as minimum required hardware for current Hotspot sources

Problem:
Current Hotspot sources use v8plus instructions
so it can't be compiled with -xarch=v8.

Solution:
Use -xarch=v8plus as default for 32-bits VM.
I also fixed the compiler version warning when
building VM for jdk 1.6 with SS11 compilers.

This fix is also going into HS15.

Reviewed by:

Fix verified (y/n): y, build C1 on sparc with SS11

Other testing:
JPRT