Request for reviews (XS): Fix of 6658428, emitting popcount on platforms without support

[Nils Eliasson]

http://cr.openjdk.java.net/~neliasso/0000000/webrev.01/ 
<http://cr.openjdk.java.net/%7Eneliasso/0000000/webrev.01/>

Fix of 6658428, emitting popcount on platforms without support

I introduced a bug in the intrinsic fix 6658428. The platform depedent 
code in Matcher::match_rule_supported didn't take actual hardware 
support into account, only if the matcher on this platforms support it.

Have added checks in match_rule_supported on all platforms inline with 
what was available on sparc and arm.

I haven't opened a new bug for this, should I do that, or reuse the one 
that broke things? Here is the fix anyway.

Thanks,
Nils
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