- Add and enable concurrent sweeper.

runtime/vm/store_buffer.h

Index: runtime/vm/store_buffer.h
===================================================================
--- runtime/vm/store_buffer.h	(revision 39568)
+++ runtime/vm/store_buffer.h	(working copy)
@@ -52,6 +52,11 @@
 class StoreBuffer {
  public:
   StoreBuffer() : blocks_(new StoreBufferBlock(NULL)), full_count_(0) {}
+  explicit StoreBuffer(bool shallow_copy) : blocks_(NULL), full_count_(0) {
+    // The value shallow_copy is only used to select this non-allocating

[koda, 2014/08/26 23:34:49]

Consider creating a useful parameter instead, like num_initial_blocks.

[Ivan Posva, 2014/08/27 01:00:22]

Leaving this one alone as well. The need for this will go away if we can remove
the shallow proxy copy of isolates.

+    // constructor. It is always expected to be true.
+    ASSERT(shallow_copy);
+  }
   ~StoreBuffer();
 
   intptr_t Count() const {