[perl #128393] [BUG] "fail" inside BUILD is ignored

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# New Ticket Created by  Salvador Ortiz 
# Please include the string:  [perl #128393]
# in the subject line of all future correspondence about this issue. 
# <URL: https://rt.perl.org/Ticket/Display.html?id=128393 >


In latest nom failing inside BUILD can't be detected anymore:

<sortiz> star-m: class Foo { submethod BUILD { fail "noway" } } ; with Foo.new 
{ say "good" } else { .fail }
<camelia> star-m 2016.04: OUTPUT«noway␤  in submethod BUILD at <tmp> line 1␤  
in block <unit> at <tmp> line 1␤␤Actually thrown at:␤  in block <unit> at <tmp> 
line 1␤␤»
<sortiz> m: class Foo { submethod BUILD { fail "noway" } } ; with Foo.new { say 
"good" } else { .fail }
<camelia> rakudo-moar 5d4949: OUTPUT«good␤»

Bisectable points to commit d5e09d9 "Streamline Mu.BUILDALL":

<sortiz> bisect: class Foo { submethod BUILD { fail "noway" } } ; Foo.new ~~ 
Failure;
<bisectable> sortiz: exit code on a “good” revision is 1 (which is bad), 
bisecting with inverted logic
<bisectable> sortiz: (2016-06-11) 
https://github.com/rakudo/rakudo/commit/d5e09d9

In my real use case, the failure is detected and reported much later, at 
DESTROY time:

WARNING: unhandled Failure detected in DESTROY:
Env open 'NoSuChDiR': No such file or directory
  in submethod BUILD at /home/sog/work/MyGIT/p6-LMDB/lib/LMDB.pm6 (LMDB) line 
240