Subzero: Improve/refactor folding loads into the next instruction.

src/IceInst.h

 //===- subzero/src/IceInst.h - High-level instructions ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the Inst class and its target-independent
@@ skipping 84 matching lines @@
 
   Variable *getDest() const { return Dest; }
 
   SizeT getSrcSize() const { return NumSrcs; }
   Operand *getSrc(SizeT I) const {
     assert(I < getSrcSize());
     return Srcs[I];
   }
 
   bool isLastUse(const Operand *Src) const;
+  void spliceLivenessInfo(Inst *OrigInst, Inst *SpliceAssn);
 
   // Returns a list of out-edges corresponding to a terminator
   // instruction, which is the last instruction of the block.
   virtual NodeList getTerminatorEdges() const {
     // All valid terminator instructions override this method.  For
     // the default implementation, we assert in case some CfgNode
     // is constructed without a terminator instruction at the end.
     llvm_unreachable(
         "getTerminatorEdges() called on a non-terminator instruction");
     return NodeList();
@@ skipping 834 matching lines @@
   static void noteHead(Ice::Inst *, Ice::Inst *) {}
   void deleteNode(Ice::Inst *) {}
 
 private:
   mutable ilist_half_node<Ice::Inst> Sentinel;
 };
 
 } // end of namespace llvm
 
 #endif // SUBZERO_SRC_ICEINST_H