[Bug tree-optimization/15826] don't use "if" to extract a single bit bit-field.

[pinskia at gcc dot gnu dot org]

-- 
Bug 15826 depends on bug 15268, which changed state.

Bug 15268 Summary: [tree-ssa] return statements are not combined on the tree level
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15268

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15826