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

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

Index: third_party/tcmalloc/chromium/src/heap-checker.cc
diff --git a/third_party/tcmalloc/chromium/src/heap-checker.cc b/third_party/tcmalloc/chromium/src/heap-checker.cc
index 5cb582d7764947105e0ae1b0e2a3ffe225a12241..0ac1faa80f8e234e1d4b415ba85f178c0e5c6821 100644
--- a/third_party/tcmalloc/chromium/src/heap-checker.cc
+++ b/third_party/tcmalloc/chromium/src/heap-checker.cc
@@ -1471,9 +1471,9 @@ static SpinLock alignment_checker_lock(SpinLock::LINKER_INITIALIZED);
           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]);