Dan Gohman 25a863dcf7 Reapply r155682, making constant folding more consistent, with a fix to work
properly with how the code handles all-undef PHI nodes.

llvm-svn: 155721
2012-04-27 17:50:22 +00:00
..
2012-03-11 06:09:17 +00:00
2012-04-04 20:33:56 +00:00
2012-04-18 18:09:53 +00:00