Remove using LLVM tools to check correctness of cast operation.

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 379 matching lines @@
   InstCast &operator=(const InstCast &) = delete;
 
 public:
   enum OpKind {
 #define X(tag, str) tag,
     ICEINSTCAST_TABLE
 #undef X
         _num
   };
 
+  static const char *getCastName(OpKind Kind);
+
   static InstCast *create(Cfg *Func, OpKind CastKind, Variable *Dest,
                           Operand *Source) {
     return new (Func->allocateInst<InstCast>())
         InstCast(Func, CastKind, Dest, Source);
   }
   OpKind getCastKind() const { return CastKind; }
   void dump(const Cfg *Func) const override;
   static bool classof(const Inst *Inst) { return Inst->getKind() == Cast; }
 
 private:
@@ skipping 449 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