[Bug target/50588] gcc produce bad inlined code with -march=athlon -O2

[mikpe at it dot uu.se]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50588

--- Comment #12 from Mikael Pettersson <mikpe at it dot uu.se> 2011-10-03 
12:56:10 UTC ---
Backporting r179284 to 4.6.1 (trivial except for the third ifcvt.c hunk which
required manual application due to a context diff) fixed the test case there
too.