RFR (M): 8146581: Minor corrections to the patch submitted for earlier bug id - 8143925

[Kharbas, Kishor]

Hi Vladimir,

For the CounterMode.crypt() patch (https://bugs.openjdk.java.net/browse/JDK-8143925) which was committed earlier, I found a minor correction in the checks performed for AES support in vm_version_x86.cpp.
Basically, a condition check was missing in a else if() block, and some old code was left by accident.
I also took this opportunity to add some more comments to make the stub code more readable/maintainable.

Bug - https://bugs.openjdk.java.net/browse/JDK-8146581
Patch - http://cr.openjdk.java.net/~vdeshpande/8146581/webrev.00/

Regards
Kishor Kharbas
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