[Bug rtl-optimization/47138] backport r158175: replace dominated uses in loop-invariant

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47138

--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-01-02 18:18:23 UTC ---
> The rev. doesn't have a testcase (and it didn't fix a bug?).

See http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00056.html