[NOT TO COMMIT!] Merge Chromium-specific changes in tcmalloc thru. the original gperftools r136.

third_party/tcmalloc/chromium/src/heap-checker.cc

 // Copyright (c) 2005, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 1453 matching lines @@
           // a byte sequence in memory that matches an address of
           // a heap object which is in fact leaked.
           // I.e. in very rare and probably not repeatable/lasting cases
           // we might miss some real heap memory leaks.
           RAW_VLOG(14, "Found pointer to %p of %"PRIuS" bytes at %p "
                       "inside %p of size %"PRIuS"",
                       ptr, object_size, object, whole_object, whole_size);
           if (VLOG_IS_ON(15)) {
             // log call stacks to help debug how come something is not a leak
             HeapProfileTable::AllocInfo alloc;
-            if (!heap_profile->FindAllocDetails(ptr, &alloc)) {
-              RAW_LOG(FATAL, "FindAllocDetails failed on ptr %p", ptr);
-            }
+            bool r = heap_profile->FindAllocDetails(ptr, &alloc);
+            r = r;              // suppress compiler warning in non-debug mode
+            RAW_DCHECK(r, "");  // sanity
             RAW_LOG(INFO, "New live %p object's alloc stack:", ptr);
             for (int i = 0; i < alloc.stack_depth; ++i) {
               RAW_LOG(INFO, "  @ %p", alloc.call_stack[i]);
             }
           }
           live_object_count += 1;
           live_byte_count += object_size;
           live_objects->push_back(AllocObject(ptr, object_size,
                                               IGNORED_ON_HEAP));
         }
@@ skipping 876 matching lines @@
 // static
 const void* HeapLeakChecker::GetAllocCaller(void* ptr) {
   // this is used only in the unittest, so the heavy checks are fine
   HeapProfileTable::AllocInfo info;
   { SpinLockHolder l(&heap_checker_lock);
     RAW_CHECK(heap_profile->FindAllocDetails(ptr, &info), "");
   }
   RAW_CHECK(info.stack_depth >= 1, "");
   return info.call_stack[0];
 }