RFR: 8164451: Generate all zero and identity forms at link time

[Claes Redestad]

Hi,

after the internal improvements in JDK-8164451, adding pre-generation of 
zero
and identity forms turns out to be very trivial.
Webrev: http://cr.openjdk.java.net/~redestad/8164451/webrev.01/
Bug: https://bugs.openjdk.java.net/browse/JDK-8164451

This removes runtime generation of 2 classes from the test in 
JDK-8086045, leaving
only 2 generated forms to deal with to get down to no(!) bytecode generation
during java.lang.invoke bootstrap.

Thanks!

/Claes