couple questions on method handle combinators

[Roland Westrelin]

> Most likely, there's something missing for Q-typed shapes which disables 
> SELECT_ALTERNATIVE intrinsic.

Thanks Vladimir, Paul and Maurizio. As I understand, the code shape that
I worry about can't be generated currently with GWT. I'll revisit that
issue when GWT has improved.

Do we expect to see a lot of uses of the loop method handle combinator
with mvt? I wonder if it's worth looking into loop combinators more?

Roland.