> The patch below is a backport of those fixes to the 4.5 branch, which
> fixes the profiled-bootstrap failure for me.  (Note that on current
> mainling, the ifcvt.c dead_or_predictable routine has been significantly
> rewritten beyond what was done by those patches.  These additional
> changes do not appear to be necessary to fix the PR ...)

Do you really need to backport the MERGE_SET_NOCLOBBER stuff?  This will cause 
the branch to optimize more aggressively than before.

-- 
Eric Botcazou

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