This fixes part of the issue described in PR gcov-profile/54487 where
there were warnings about mismatches due to slight differences in the
merged histograms in different object files. This can happen due to
the truncating integer division in the merge routine, which could result
in slightly different histograms when summaries are merged in different
orders.

2012-09-07  Teresa Johnson  <tejohnson@google.com>

        PR gcov-profile/54487
	* libgcc/libgcov.c (gcov_exit): Avoid warning on histogram
        differences.

From-SVN: r191074