Remove the is_nested bit from the BlockInfo structure.

syzygy/agent/asan/heaps/simple_block_heap_unittest.cc

 // Copyright 2014 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 38 matching lines @@
 TEST(SimpleBlockHeapTest, EndToEnd) {
   WinHeap win_heap;
   SimpleBlockHeap h(&win_heap);
 
   BlockLayout layout = {};
   BlockInfo block = {};
 
   // Allocate and free a zero-sized allocation. This should succeed
   // by definition.
   void* alloc = h.AllocateBlock(0, 0, 0, &layout);
-  BlockInitialize(layout, alloc, false, &block);
+  BlockInitialize(layout, alloc, &block);
   EXPECT_TRUE(h.FreeBlock(block));
 
   // Make a bunch of different sized allocations.
   BlockInfoSet blocks;
   for (uint32_t i = 1; i < 1024 * 1024; i <<= 1) {
     void* alloc = h.AllocateBlock(i, 0, 0, &layout);
-    BlockInitialize(layout, alloc, false, &block);
+    BlockInitialize(layout, alloc, &block);
     blocks.insert(block);
   }
 
   // Now free them.
   BlockInfoSet::const_iterator it = blocks.begin();
   for (; it != blocks.end(); ++it)
     EXPECT_TRUE(h.FreeBlock(*it));
 }
 
 TEST(SimpleBlockHeap, IsAllocated) {
@@ skipping 16 matching lines @@
 
   h.Lock();
   EXPECT_TRUE(h.TryLock());
   h.Unlock();
   h.Unlock();
 }
 
 }  // namespace heaps
 }  // namespace asan
 }  // namespace agent