Merge google-perftools r109 (the current contents of third_party/tcmalloc/vendor)

third_party/tcmalloc/chromium/src/base/low_level_alloc.cc

Index: third_party/tcmalloc/chromium/src/base/low_level_alloc.cc
===================================================================
--- third_party/tcmalloc/chromium/src/base/low_level_alloc.cc	(revision 87277)
+++ third_party/tcmalloc/chromium/src/base/low_level_alloc.cc	(working copy)
@@ -59,7 +59,9 @@
 // ---------------------------------------------------------------------------
 static const int kMaxLevel = 30;
 
-namespace {
+// We put this class-only struct in a namespace to avoid polluting the
+// global namespace with this struct name (thus risking an ODR violation).
+namespace low_level_alloc_internal {
   // This struct describes one allocated block, or one free block.
   struct AllocList {
     struct Header {
@@ -79,7 +81,9 @@
                                   // LLA_SkiplistLevels()
   };
 }
+using low_level_alloc_internal::AllocList;
 
+
 // ---------------------------------------------------------------------------
 // A trivial skiplist implementation.  This is used to keep the freelist
 // in address order while taking only logarithmic time per insert and delete.
@@ -208,7 +212,7 @@
 static const intptr_t kMagicUnallocated = ~kMagicAllocated;
 
 namespace {
-  class ArenaLock {
+  class SCOPED_LOCKABLE ArenaLock {
    public:
     explicit ArenaLock(LowLevelAlloc::Arena *arena)
         EXCLUSIVE_LOCK_FUNCTION(arena->mu)
@@ -229,7 +233,7 @@
       this->arena_->mu.Lock();
     }
     ~ArenaLock() { RAW_CHECK(this->left_, "haven't left Arena region"); }
-    void Leave() UNLOCK_FUNCTION(arena_->mu) {
+    void Leave() UNLOCK_FUNCTION() {
       this->arena_->mu.Unlock();
 #if 0
       if (this->mask_valid_) {