[perl #115502] [BUG] 'try' at BEGIN time hangs in Rakudo

[Christian Bartolomaeus via RT]

This does no longer hang.

$ perl6-m -e 'BEGIN { try 0 }; say "alive"'
alive
$ perl6-p -e 'BEGIN { try 0 }; say "alive"'
alive
$ perl6-j -e 'BEGIN { try 0 }; say "alive"'
alive

I added a test to S04-phasers/begin.t with the following commit: 
https://github.com/perl6/roast/commit/05bf75e3b6