RRF: 8187123: (reflect) Class#getCanonicalName and Class#getSimpleName is a part of performance issue

[Claes Redestad]

Hi,

please review this patch to enable caching of getCanonicalName and 
getSimpleName, repeated calls of which has been reported to be a 
performance
bottleneck. The caching improves performance of these methods by up to 20x.

Rather than adding new fields to Class itself, which would have 
footprint implications on classes, we can piggy-back on 
Class$ReflectionData object.

Webrev: http://cr.openjdk.java.net/~redestad/8187123/open.02/
Bug: https://bugs.openjdk.java.net/browse/JDK-8187123

Thanks!

/Claes