RFR: 8199865: Avoid initializing ShortCache in ProxyGenerator

[mandy chung]

Looks fine.  Nice small perf gain.

Mandy

On 3/20/18 7:47 AM, Claes Redestad wrote:
> Hi,
>
> by using Map<Object, Integer> instead of Map<Object, Short> 
> (preserving shortness of values) we can avoid having ProxyGenerator 
> depend on Short$ShortCache, which is a small startup and footprint win 
> (since Integer$IntegerCache is 100% likely to have already been 
> initialized):
>
> http://cr.openjdk.java.net/~redestad/8199865/open.00/
>
> Thanks!
>
> /Claes
>