RFR: 8003557: NPG: Klass* const k should be const Klass* k.

[Yumin Qi]

Please have codereview for
8003557: NPG: Klass* const k should be const Klass* k.

Description: This is leftover from NPG, in which converted const 
KlassOop to Klass* const which did not keep the original intention. As a 
def, const KlassOop is not as it is defined. In this webrev, I tried to 
find/change as many as possible such places, the remaining of this work 
may go on with other fixes in future as discovered.

http://cr.openjdk.java.net/~minqi/8003557/webrev/

Thanks
Yumin