RFR: 8215990: Avoid using reflection to create common default URLStreamHandlers

[Claes Redestad]

Hi,

during bootstrap we load and use at least two of the jrt, file and jar
URLStreamHandlers via URL$DefaultFactory. Avoiding use of reflection to
instantiate these slightly speed up bootstrap by reducing number of
classes loaded and doing fewer relatively expensive reflective
operations:

http://cr.openjdk.java.net/~redestad/8215990/jdk.00/

Thanks!

/Claes