Subzero: Fold icmp into br/select lowering.

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 498 matching lines @@
   Target->doNopInsertion();
 }
 
 // Drives the target lowering.  Passes the current instruction and the
 // next non-deleted instruction for target lowering.
 void CfgNode::genCode() {
   TargetLowering *Target = Func->getTarget();
   LoweringContext &Context = Target->getContext();
   // Lower the regular instructions.
   Context.init(this);
+  Target->initNodeForLowering(this);
   while (!Context.atEnd()) {
     InstList::iterator Orig = Context.getCur();
     if (llvm::isa<InstRet>(*Orig))
       setHasReturn();
     Target->lower();
     // Ensure target lowering actually moved the cursor.
     assert(Context.getCur() != Orig);
   }
   // Do preliminary lowering of the Phi instructions.
   Target->prelowerPhis();
@@ skipping 673 matching lines @@
       if (!First)
         Str << ", ";
       First = false;
       Str << "%" << I->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice