8276983: Small fixes to DumpAllocStat::print_stats

Reviewed-by: dholmes, iklam

Author: tstuefe

src/hotspot/share/cds/dumpAllocStats.cpp

@@ -42,14 +42,6 @@ void DumpAllocStats::print_stats(int ro_all, int rw_all) {
   _counts[RO][StringBucketType] = _string_stats.bucket_count;
   _bytes [RO][StringBucketType] = _string_stats.bucket_bytes;
 
-  // prevent divide-by-zero
-  if (ro_all < 1) {
-    ro_all = 1;
-  }
-  if (rw_all < 1) {
-    rw_all = 1;
-  }
-
   int all_ro_count = 0;
   int all_ro_bytes = 0;
   int all_rw_count = 0;
@@ -102,8 +94,11 @@ void DumpAllocStats::print_stats(int ro_all, int rw_all) {
                        all_rw_count, all_rw_bytes, all_rw_perc,
                        all_count, all_bytes, all_perc);
 
-  assert(all_ro_bytes == ro_all, "everything should have been counted");
-  assert(all_rw_bytes == rw_all, "everything should have been counted");
+  msg.flush();
+
+  assert(all_ro_bytes == ro_all && all_rw_bytes == rw_all,
+         "everything should have been counted (used/counted: ro %d/%d, rw %d/%d",
+         ro_all, all_ro_bytes, rw_all, all_rw_bytes);
 
 #undef fmt_stats
 }