[Bug c++/49039] [4.6/4.7 Regression] LLVM StringRef miscompilation with -O2

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49039

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-05-18 
17:40:24 UTC ---
Created attachment 24286
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24286
gcc46-pr49039.patch

Untested fix.