[perl #116895] [BUG] [JVM] LTM alternation captures the wrong stuff when backtracking in Rakudo

[Christian Bartolomaeus via RT]

This works now on the JVM backend as well (test in 
S05-match/capturing-contexts.t is passing). Fixed with nqp commit 
https://github.com/perl6/nqp/commit/f22b0b2d0e

I'm closing this ticket as 'resolved'.