Fix format warning which showed up on FreeBSD 11.3.

	PR bootstrap/93962
	* value-prof.c (dump_histogram_value): Use std::abs.

gcc/ChangeLog

+2020-03-04  Andrew Pinski  <apinski@marvell.com>
+
+	PR bootstrap/93962
+	* value-prof.c (dump_histogram_value): Use std::abs.
+
 2020-03-04  Martin Sebor  <msebor@redhat.com>
 
 	PR tree-optimization/93986

gcc/value-prof.c

@@ -266,7 +266,7 @@ dump_histogram_value (FILE *dump_file, histogram_value hist)
 	  if (hist->hvalue.counters)
 	    {
 	      fprintf (dump_file, " all: %" PRId64 "%s, values: ",
-		       abs ((int64_t) hist->hvalue.counters[0]),
+		       std::abs ((int64_t) hist->hvalue.counters[0]),
 		       hist->hvalue.counters[0] < 0
 		       ? " (values missing)": "");
 	      for (unsigned i = 0; i < GCOV_TOPN_VALUES; i++)