RFR (XS) 8057925: PrintSymbolTableSizeHistogram prints misleading output

[Aleksey Shipilev]

Hi,

Please review and sponsor this simple fix:
  http://cr.openjdk.java.net/~shade/8057925/webrev.01/
  https://bugs.openjdk.java.net/browse/JDK-8057925

Current output is responsible for a few hairs out of my head: you change
SymbolTableSize, and "number [of] chains that length" does not change...
And then you realize that is a *symbol length* histogram.

Thanks,
-Aleksey.