[perl #116314] [BUG] 'for' loops in phasers in 'for' loops don't run in Rakudo

[Christian Bartolomaeus via RT]

for loops in phasers in for loops are run now:

> for 1..2 { ENTER { .say for <foo bar> }; .say}
foo
bar
1
foo
bar
2

I added a test to S04-phasers/enter-leave.t with the following commit: 
https://github.com/perl6/roast/commit/0a2c9a8008