Subzero: Change the way bitcast stack slot lowering is handled.

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 333 matching lines @@
   // validation is not.)
   llvm::BitVector LiveOrig = Live;
   Live.resize(Liveness->getNumGlobalVars());
   // Non-global arguments in the entry node are allowed to be live on
   // entry.
   bool IsEntry = (Func->getEntryNode() == this);
   if (!(IsEntry || Live == LiveOrig)) {
     // This is a fatal liveness consistency error.  Print some
     // diagnostics and abort.
     Ostream &Str = Func->getContext()->getStrDump();
-    Func->setCurrentNode(NULL);
+    Func->resetCurrentNode();
     Str << "LiveOrig-Live =";
     for (SizeT i = Live.size(); i < LiveOrig.size(); ++i) {
       if (LiveOrig.test(i)) {
         Str << " ";
         Liveness->getVariable(i, this)->dump(Func);
       }
     }
     Str << "\n";
     llvm_unreachable("Fatal inconsistency in liveness analysis");
   }
@@ skipping 213 matching lines @@
          I != E; ++I) {
       if (I != OutEdges.begin())
         Str << ", ";
       Str << "%" << (*I)->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice