[Bug tree-optimization/52448] [4.4/4.5/4.6/4.7 Regression] cselim broken with calls

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52448

--- Comment #3 from Michael Matz <matz at gcc dot gnu.org> 2012-03-01 12:56:40 UTC ---
Created attachment 26802
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26802
candidate fix

This fixes the problem by remembering the last seen call and checking if
it's before or after the candidate stmt that might make us non-trapping.
It'll conflict with the patch from PR 52445 for now.