RFR: 8146686: Create the schemeSpecificPart for non-opaque URIs lazily

[Claes Redestad]

Hi,

please review this patch to lazily create schemeSpecificPart for 
non-opaque URIs. This change accounts for some improvement in footprint 
characteristics and a 10-20% improvement on URI creation 
microbenchmarks, while not regressing notably on a targetted 
microbenchmark which explicitly generate and retrieve the 
schemeSpecificPart.

Bug: https://bugs.openjdk.java.net/browse/JDK-8146686
Webrev: http://cr.openjdk.java.net/~redestad/8146686/webrev.01/

Thanks!

/Claes
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