http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59189

--- Comment #2 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
It seems that simply there was no user of the valid CFG after m_d_r
pass.

> Maybe this should be fixed by putting the introduced unconditional
> branch instruction into a separate basic block.

Sounds plausible.

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