Subzero: Fix labels for block profiling.

src/IceCfg.cpp

 //===- subzero/src/IceCfg.cpp - Control flow graph implementation ---------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 52 matching lines @@
 }
 
 CfgNode *Cfg::makeNode() {
   SizeT LabelIndex = Nodes.size();
   CfgNode *Node = CfgNode::create(this, LabelIndex);
   Nodes.push_back(Node);
   return Node;
 }
 
 void Cfg::swapNodes(NodeList &NewNodes) {
+  assert(Nodes.size() == NewNodes.size());
   Nodes.swap(NewNodes);
   for (SizeT I = 0, NumNodes = getNumNodes(); I < NumNodes; ++I)
     Nodes[I]->resetIndex(I);
 }
 
 void Cfg::addArg(Variable *Arg) {
   Arg->setIsArg();
   Args.push_back(Arg);
 }
 
@@ skipping 690 matching lines @@
     }
   }
   // Print each basic block
   for (CfgNode *Node : Nodes)
     Node->dump(this);
   if (isVerbose(IceV_Instructions))
     Str << "}\n";
 }
 
 } // end of namespace Ice