FDO usability trivial patch to fix div by zero error with insane profile

[Xinliang David Li]

This is a trivial patch to deal with bad profile data (from
multi-threaded programs) that leads to divide by zero error.

Ok for trunk?

Thanks,

David



2011-04-15  Xinliang David Li  <davidxl@google.com>

	* ipa-inline.c (cgraph_decide_recursive_inlining): Fix
	div by zero error with insane profile.
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