[Bug tree-optimization/51877] [4.7 Regression] XEmacs miscompilation due to tail merging

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51877

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-17 
07:49:33 UTC ---
Created attachment 26346
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26346
gcc47-pr51877.patch

Untested fix.