value-prof: Fix abs uses in value-prof.c [PR93962]

Jeff has recently fixed dump_histogram_value to use std::abs instead of abs,
because on FreeBSD apparently the ::abs isn't overloaded and only has
int abs (int);
Seems on Solaris /usr/include/iso/stdlib_iso.h abs has:
int abs (int);
long abs (long);
overloads but already not
long long abs (long long);
and there is another abs use in get_nth_most_common_value, also on int64_t.
The long long std::abs (long long); overload is there only in C++11 and we
in GCC10 still support C++98.

Martin has said that a counter should never be INT64_MIN, so IMHO it is
better to use abs_hwi which will assert that.

2020-03-11  Jakub Jelinek  <jakub@redhat.com>

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

gcc/ChangeLog

 2020-03-11  Jakub Jelinek  <jakub@redhat.com>
 
+	PR bootstrap/93962
+	* value-prof.c (dump_histogram_value): Use abs_hwi instead of
+	std::abs.
+	(get_nth_most_common_value): Use abs_hwi instead of abs.
+
 	PR middle-end/94111
 	* dfp.c (decimal_to_binary): Only use decimal128ToString if from->cl
 	is rvc_normal, otherwise use real_to_decimal to print the number to

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: ",
-		       std::abs ((int64_t) hist->hvalue.counters[0]),
+		       (int64_t) abs_hwi (hist->hvalue.counters[0]),
 		       hist->hvalue.counters[0] < 0
 		       ? " (values missing)": "");
 	      for (unsigned i = 0; i < GCOV_TOPN_VALUES; i++)
@@ -743,7 +743,7 @@ get_nth_most_common_value (gimple *stmt, const char *counter_type,
   *count = 0;
   *value = 0;
 
-  gcov_type read_all = abs (hist->hvalue.counters[0]);
+  gcov_type read_all = abs_hwi (hist->hvalue.counters[0]);
 
   gcov_type v = hist->hvalue.counters[2 * n + 1];
   gcov_type c = hist->hvalue.counters[2 * n + 2];