Request for reviews (M): 7006505: Use kstat info to identify SPARC processor

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/7006505/webrev

Fixed 7006505: Use kstat info to identify SPARC processor

Currently we use cpu count (32) to distinguish T1 Sparc
from latest T processors and it is not clear when/if we can
get an interface which provides information we need.

It was suggested to read Solaris kstat data to get more
precise CPU information:

  implementation:   UltraSPARC-T2+ (chipid 0, clock 1414 MHz)

Unfortunately Solaris 8 (used to build JDK6) has different
kstat structure vs Solaris 10 (used to build JDK7) so
I have to work around this problem.

Verified with JPRT build and test for jdk6 and jdk7.

Additional changes:
Renamed is_niagara1 to is_niagara since it checks for
T family cpus not just T1.
Reduced heap size for test_gamma to -Xmx32m since
64bit VM reserves 1/4 of physical memory by default.
Fixed print format for reserved heap size.
Print compressed oops mode with -XX:+PrintMiscellaneous -XX:+Verbose.
Add check for VIS3.
Use FXTOD and FXTOS on T series and SPARC64
(tested with microbenchmark).