POC javac can compile invokedynamic

[John Rose]

I just put out a patch (mlvm/langtools/meth.patch) which allows javac  
to compile MH and invokedynamic calls.

This should make it easier to experiment with the modified JVM,  
without resorting to direct bytecode editing or assembling.

Caveat:  I don't know whether this is the right way for javac to go  
in the long run; please treat the present design as a tentative  
experiment.

-- John