[Bug tree-optimization/50078] [4.6 Regression] combine wrong code: volatile accesses optimized out

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50078

--- Comment #14 from Mikael Pettersson <mikpe at it dot uu.se> 2011-12-10 
16:24:38 UTC ---
The original test case now compiles correctly for me with gcc-4.6-20111209 for
both i686-linux and armv5tel-linux-gnueabi targets.