Subzero: Reduce copying of Liveness bitvectors.

src/IceCfg.h

 //===- subzero/src/IceCfg.h - Control flow graph ----------------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 201 matching lines @@
 
   /// \name  Manage the CurrentNode field.
   /// CurrentNode is used for validating the Variable::DefNode field during
   /// dumping/emitting.
   /// @{
   void setCurrentNode(const CfgNode *Node) { CurrentNode = Node; }
   void resetCurrentNode() { setCurrentNode(nullptr); }
   const CfgNode *getCurrentNode() const { return CurrentNode; }
   /// @}
 
+  /// Get the total amount of memory held by the per-Cfg allocator.  This is
+  /// mostly meant for use inside a debugger.
+  static size_t getTotalMemoryMB();
+
   void emit();
   void emitIAS();
   static void emitTextHeader(const IceString &MangledName, GlobalContext *Ctx,
                              const Assembler *Asm);
   void dump(const IceString &Message = "");
 
   /// Allocate data of type T using the per-Cfg allocator.
   template <typename T> T *allocate() { return Allocator->Allocate<T>(); }
 
   /// Allocate an array of data of type T using the per-Cfg allocator.
@@ skipping 75 matching lines @@
 
 public:
   static void TlsInit() { CfgAllocatorTraits::init(); }
 };
 
 template <> Variable *Cfg::makeVariable<Variable>(Type Ty);
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICECFG_H