tree 6df7efad2f7777bb0a4dbcbbe719750393eac531
parent edb83c606e034d76bed1331f34cdc435df47bb95
author Nicolas Geoffray <ngeoffray@google.com> 1434578945 +0100
committer Nicolas Geoffray <ngeoffray@google.com> 1434579099 +0100

Fix a bug in optimizing when the null constant has been DCE.

If it has been DCE, we should create a new one, instead of
using the old one.

Also move the first DCE to a place where it could actually
be useful.

bug:21870788

Change-Id: I28fc52ae481ef92cba45fc1b5abcf07c995f524c