RFR 8019375: Internal symbol table size should be tunable.

[Kevin Walls]

Hi,

I'd like to get reviews on this change to make the size of the symbol 
table tunable.  This can be a performance benefit to some apps, i.e. 
when the symbol table becomes overloaded (see PrintStringTableStatistics 
output).

This work here actually comes from Coleen.  I'm happy to take any 
further comments and update.

http://cr.openjdk.java.net/~kevinw/8019375/webrev.01/
http://bugs.sun.com/view_bug.do?bug_id=8019375

This uses SymbolTableSize as the tunable name.  (Another suggestion and 
possibile name, was PredictedMaxVMStrings to avoid talking explicity 
about the internal format.  Comments welcome!...)

Thanks
Kevin