[Sanitizers] Add total primary allocator RSS to allocator report.

[alekseyshl]

Summary

.

[cryptoad]

LGTM

lib/sanitizer_common/sanitizer_allocator_primary64.h

Printf(
         region->mapped_user >> 10, region->stats.n_allocated,
         region->stats.n_freed, in_use, region->num_freed_chunks, avail_chunks,
         rss >> 10, region->rtoi.num_releases,
         region->rtoi.last_released_bytes >> 10,
         SpaceBeg() + kRegionSize * class_id);
   }
 
   void PrintStats() {
+    uptr rss_stats[kNumClasses];
+    for (uptr class_id = 0; class_id < kNumClasses; class_id++)
+      rss_stats[class_id] = SpaceBeg() + kRegionSize * class_id;
+    GetMemoryProfile(FillMemoryProfile, rss_stats, kNumClasses);
+
     uptr total_mapped = 0;
+    uptr total_rss = 0;
     uptr n_allocated = 0;
     uptr n_freed = 0;
     for (uptr class_id = 1; class_id < kNumClasses; class_id++) {
       RegionInfo *region = GetRegionInfo(class_id);
+      if (region->mapped_user != 0) {
         total_mapped += region->mapped_user;
+        total_rss += rss_stats[class_id];
+      }
       n_allocated += region->stats.n_allocated;
       n_freed += region->stats.n_freed;
     }
-    Printf("Stats: SizeClassAllocator64: %zdM mapped in %zd allocations; "
-           "remains %zd\n",
-           total_mapped >> 20, n_allocated, n_allocated - n_freed);
-    uptr rss_stats[kNumClasses];
-    for (uptr class_id = 0; class_id < kNumClasses; class_id++)
-      rss_stats[class_id] = SpaceBeg() + kRegionSize * class_id;
-    GetMemoryProfile(FillMemoryProfile, rss_stats, kNumClasses);
+
+    Printf("Stats: SizeClassAllocator64: %zdM mapped (%zdM rss) in "
+           "%zd allocations; remains %zd\n", total_mapped >> 20,
+           total_rss >> 20, n_allocated, n_allocated - n_freed);
     for (uptr class_id = 1; class_id < kNumClasses; class_id++)
       PrintStats(class_id, rss_stats[class_id]);
   }
 
   // ForceLock() and ForceUnlock() are needed to implement Darwin malloc zone
   // introspection API.
   void ForceLock() {
     for (uptr i = 0; i < kNumClasses; i++) {