RFR: 8212726: Replace some use of drop- and foldArguments with filtering argument combinator in StringConcatFactory

[Claes Redestad]

On 2018-10-22 14:07, Jim Laskey wrote:
> Thank you for doing this. 

Thanks for looking at this, Jim!

> The MethodHandle changes will simplify many a use case.

Thanks! I'm particularly happy with how this optimization helped
simplify the SCF code - no reason to think it won't help simplify other
use cases too.

/Claes