Request for review 7158800: Improve storage of symbol tables

[Coleen Phillimore]

Summary: Use an alternate version of hashing algorithm for symbol and 
string tables and after a certain bucket size to improve performance

This code rehashes the symbol table and/or string table using the 
murmur3 hash algorithm, if the buckets become unbalanced.

This is the JVM side to the JDK performance improvement in changeset 
ttp://hg.openjdk.java.net/jdk8/tl/jdk/rev/43bd5ee0205e .

open webrev at http://cr.openjdk.java.net/~coleenp/7158800_5/

Thanks,
Coleen