Remove the is_nested bit from the BlockInfo structure.

syzygy/agent/asan/heap_managers/block_heap_manager.cc

Index: syzygy/agent/asan/heap_managers/block_heap_manager.cc
diff --git a/syzygy/agent/asan/heap_managers/block_heap_manager.cc b/syzygy/agent/asan/heap_managers/block_heap_manager.cc
index 9fbde682fdfb1b3131486b057435a2c7deb51fac..515ab9e7db07e0951237bb45c2d79bec78aabe59 100644
--- a/syzygy/agent/asan/heap_managers/block_heap_manager.cc
+++ b/syzygy/agent/asan/heap_managers/block_heap_manager.cc
@@ -233,7 +233,7 @@ void* BlockHeapManager::Allocate(HeapId heap_id, uint32_t bytes) {
   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);