[NOT TO COMMIT!] Replace third_party/tcmalloc/chromium with tcmalloc r136 (the latest).

third_party/tcmalloc/chromium/src/page_heap_allocator.h

Index: third_party/tcmalloc/chromium/src/page_heap_allocator.h
diff --git a/third_party/tcmalloc/chromium/src/page_heap_allocator.h b/third_party/tcmalloc/chromium/src/page_heap_allocator.h
index eee1590323511ec0ae312c6ad256f60fe16a493e..d83528203f1a0ff935d72547753fe3f5f344102e 100644
--- a/third_party/tcmalloc/chromium/src/page_heap_allocator.h
+++ b/third_party/tcmalloc/chromium/src/page_heap_allocator.h
@@ -36,9 +36,7 @@
 #include <stddef.h>                     // for NULL, size_t
 
 #include "common.h"            // for MetaDataAlloc
-#include "free_list.h"          // for FL_Push/FL_Pop
-#include "internal_logging.h"  // for ASSERT, CRASH
-#include "system-alloc.h"      // for TCMalloc_SystemAddGuard
+#include "internal_logging.h"  // for ASSERT
 
 namespace tcmalloc {
 
@@ -64,31 +62,20 @@ class PageHeapAllocator {
     // Consult free list
     void* result;
     if (free_list_ != NULL) {
-      result = FL_Pop(&free_list_);
+      result = free_list_;
+      free_list_ = *(reinterpret_cast<void**>(result));
     } else {
       if (free_avail_ < sizeof(T)) {
         // Need more room. We assume that MetaDataAlloc returns
         // suitably aligned memory.
         free_area_ = reinterpret_cast<char*>(MetaDataAlloc(kAllocIncrement));
         if (free_area_ == NULL) {
-          CRASH("FATAL ERROR: Out of memory trying to allocate internal "
-                "tcmalloc data (%d bytes, object-size %d)\n",
-                kAllocIncrement, static_cast<int>(sizeof(T)));
-        }
-
-        // This guard page protects the metadata from being corrupted by a
-        // buffer overrun. We currently have no mechanism for freeing it, since
-        // we never release the metadata buffer. If that changes we'll need to
-        // add something like TCMalloc_SystemRemoveGuard.
-        size_t guard_size = TCMalloc_SystemAddGuard(free_area_,
-                                                    kAllocIncrement);
-        free_area_ += guard_size;
-        free_avail_ = kAllocIncrement - guard_size;
-        if (free_avail_ < sizeof(T)) {
-          CRASH("FATAL ERROR: Insufficient memory to guard internal tcmalloc "
-                "data (%d bytes, object-size %d, guard-size %d)\n",
-                kAllocIncrement, static_cast<int>(sizeof(T)), guard_size);
+          Log(kCrash, __FILE__, __LINE__,
+              "FATAL ERROR: Out of memory trying to allocate internal "
+              "tcmalloc data (bytes, object-size)",
+              kAllocIncrement, sizeof(T));
         }
+        free_avail_ = kAllocIncrement;
       }
       result = free_area_;
       free_area_ += sizeof(T);
@@ -99,7 +86,8 @@ class PageHeapAllocator {
   }
 
   void Delete(T* p) {
-    FL_Push(&free_list_, p);
+    *(reinterpret_cast<void**>(p)) = free_list_;
+    free_list_ = p;
     inuse_--;
   }