[9] RFR (M): 8050053: Improve caching of different invokers

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8050053/webrev.00
https://bugs.openjdk.java.net/browse/JDK-8050053

Improve sharing of different invokers: basic, generic & exact invokers, 
uninitialized call site invoker and NamedFunction invoker are changed.

Testing: jdk/java/lang/invoke, nashorn, octane w/ "-ea -esa".

Reviewed-by: vlivanov, ?
Contributed-by: john.r.rose at oracle.com

Thanks!

Best regards,
Vladimir Ivanov