Subzero: Add a few performance measurement tools.

src/IceCfgNode.cpp

 //===- subzero/src/IceCfgNode.cpp - Basic block (node) implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the CfgNode class, including the complexities
@@ skipping 477 matching lines @@
   Ostream &Str = Func->getContext()->getStrDump();
   Liveness *Liveness = Func->getLiveness();
   if (Func->getContext()->isVerbose(IceV_Instructions)) {
     Str << getName() << ":\n";
   }
   // Dump list of predecessor nodes.
   if (Func->getContext()->isVerbose(IceV_Preds) && !InEdges.empty()) {
     Str << "    // preds = ";
     bool First = true;
     for (CfgNode *I : InEdges) {
-      if (First)
+      if (!First)
         Str << ", ";
       First = false;
       Str << "%" << I->getName();
     }
     Str << "\n";
   }
   // Dump the live-in variables.
   llvm::BitVector LiveIn;
   if (Liveness)
     LiveIn = Liveness->getLiveIn(this);
@@ skipping 24 matching lines @@
         Str << " %" << Liveness->getVariable(i, this)->getName();
       }
     }
     Str << "\n";
   }
   // Dump list of successor nodes.
   if (Func->getContext()->isVerbose(IceV_Succs)) {
     Str << "    // succs = ";
     bool First = true;
     for (CfgNode *I : OutEdges) {
-      if (First)
+      if (!First)
         Str << ", ";
       First = false;
       Str << "%" << I->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice