8130115: REDO - Reduce Symbol::_identity_hash to 2 bytes
Summary: Convert Symbol::_identity_hash from integer to short integer to save two bytes. Also change identity_hash() to have 'this' and first two bytes of symbol join the calculation.
Reviewed-by: iklam, coleenp, shade
coleenp [Fri, 14 Aug 2015 15:08:55 -0400] rev 32355
8133557: Missing test before a branch when checking for MethodCounters in TemplateTable::branch() on x86
Reviewed-by: kvn, coleenp
Contributed-by: richard.reingruber@sap.com