Optimizing skipValue() to avoid allocation.

I ran a quick benchmark on a desktop VM: this shortened the time
to parse a complete JSON document by ~25%.

Change-Id: Id479734654addfe86f4bf251f0dd6e78843023bf
http://microbenchmarks.appspot.com/run/jessewilson@google.com/twitter.JsonParseBenchmark/366001
1 file changed