Remove the is_nested bit from the BlockInfo structure.

syzygy/agent/asan/heap_managers/block_heap_manager.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 215 matching lines @@
     }
   }
 
   // The allocation can fail if we're out of memory.
   if (alloc == nullptr)
     return nullptr;
 
   DCHECK_NE(static_cast<void*>(nullptr), alloc);
   DCHECK_EQ(0u, reinterpret_cast<size_t>(alloc) % kShadowRatio);
   BlockInfo block = {};
-  BlockInitialize(block_layout, alloc, false, &block);
+  BlockInitialize(block_layout, alloc, &block);
 
   // Poison the redzones in the shadow memory as early as possible.
   shadow_->PoisonAllocatedBlock(block);
 
   block.header->alloc_stack = stack_cache_->SaveStackTrace(stack);
   block.header->free_stack = nullptr;
   block.header->state = ALLOCATED_BLOCK;
 
   block.trailer->heap_id = heap_id;
 
@@ skipping 865 matching lines @@
   if (trailer_has_valid_heap_id)
     return block_info->trailer->heap_id;
 
   // Unfortunately, there's no way to know which heap this block belongs to.
   return 0;
 }
 
 }  // namespace heap_managers
 }  // namespace asan
 }  // namespace agent