Add support for vector types and vector constants.

src/IceOperand.h

 //===- subzero/src/IceOperand.h - High-level operands -----------*- 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 Operand class and its target-independent
@@ skipping 102 matching lines @@
 template <typename T, Operand::OperandKind K>
 class ConstantPrimitive : public Constant {
 public:
   static ConstantPrimitive *create(GlobalContext *Ctx, Type Ty, T Value,
                                    uint32_t PoolEntryID) {
     return new (Ctx->allocate<ConstantPrimitive>())
         ConstantPrimitive(Ty, Value, PoolEntryID);
   }
   T getValue() const { return Value; }
   using Constant::emit;
-  virtual void emit(GlobalContext *Ctx) const {
-    Ostream &Str = Ctx->getStrEmit();
-    Str << getValue();
-  }
+  // The target needs to implement this for each ConstantPrimitive
+  // specialization.
+  virtual void emit(GlobalContext *Ctx) const;
   using Constant::dump;
   virtual void dump(GlobalContext *Ctx) const {
     Ostream &Str = Ctx->getStrDump();
     Str << getValue();
   }
 
   static bool classof(const Operand *Operand) {
     return Operand->getKind() == K;
   }
 
@@ skipping 327 matching lines @@
   Variable *LoVar;
   Variable *HiVar;
   // VarsReal (and Operand::Vars) are set up such that Vars[0] ==
   // this.
   Variable *VarsReal[1];
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEOPERAND_H