Eagerly build exemplars for JFunctionN
Loosen test to work with -target:1.{6,8}
Force run/t7974.scala to use GenASM
Fixup arg permutation
Fixup examplar
Support Unit returning functions.
Support method-handle based closures in GenASM
Refactor BCode variant of genInvokeDynamicLambda
Support specialized method-handle based lambdas
WIP