tree 7364ec231d39291af44245dc16b0ca48919862d0
parent 74768fb83073a2ae84c9173d4fc53654e3092b24
author Nicolas Geoffray <ngeoffray@google.com> 1450188719 +0000
committer Nicolas Geoffray <ngeoffray@google.com> 1450268540 +0000

Detect phi cycles.

Having reference and non-reference phi equivalent, only happened
for the 0/null constant. To avoid such occurences, we must
detect phi cycles.

bug:25493693

Change-Id: Ie1a8460c3abacca96c299da107fa4407e17dd792