gcov: fix streaming of HIST_TYPE_IOR histogram type.

gcc/ChangeLog:

	PR gcov-profile/64636
	* value-prof.c (stream_out_histogram_value): Allow negative
	values for HIST_TYPE_IOR.

(cherry picked from commit 1921ebc)

gcc/value-prof.c

@@ -332,7 +332,10 @@ stream_out_histogram_value (struct output_block *ob, histogram_value hist)
       /* When user uses an unsigned type with a big value, constant converted
 	 to gcov_type (a signed type) can be negative.  */
       gcov_type value = hist->hvalue.counters[i];
-      if (hist->type == HIST_TYPE_TOPN_VALUES)
+      if (hist->type == HIST_TYPE_TOPN_VALUES
+	  || hist->type == HIST_TYPE_IOR)
+	/* Note that the IOR counter tracks pointer values and these can have
+	   sign bit set.  */
 	;
       else
 	gcc_assert (value >= 0);