Convert Constant->emit() definitions to allow multiple targets to define them.

src/IceTargetLoweringX8632.h

 //===- subzero/src/IceTargetLoweringX8632.h - x86-32 lowering ---*- 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 TargetLoweringX8632 class, which
@@ skipping 36 matching lines @@
   bool hasFramePointer() const override { return IsEbpBasedFrame; }
   SizeT getFrameOrStackReg() const override {
     return IsEbpBasedFrame ? RegX8632::Reg_ebp : RegX8632::Reg_esp;
   }
   size_t typeWidthInBytesOnStack(Type Ty) const override {
     // Round up to the next multiple of 4 bytes.  In particular, i1,
     // i8, and i16 are rounded up to 4 bytes.
     return (typeWidthInBytes(Ty) + 3) & ~3;
   }
   void emitVariable(const Variable *Var) const override;
+
+  const char *getConstantPrefix() const final { return "$"; }
+  void emit(const ConstantUndef *C) const final;
+  void emit(const ConstantInteger32 *C) const final;
+  void emit(const ConstantInteger64 *C) const final;
+  void emit(const ConstantFloat *C) const final;
+  void emit(const ConstantDouble *C) const final;
+
   void lowerArguments() override;
   void addProlog(CfgNode *Node) override;
   void addEpilog(CfgNode *Node) override;
   // Ensure that a 64-bit Variable has been split into 2 32-bit
   // Variables, creating them if necessary.  This is needed for all
   // I64 operations, and it is needed for pushing F64 arguments for
   // function calls using the 32-bit push instruction (though the
   // latter could be done by directly writing to the stack).
   void split64(Variable *Var);
   void finishArgumentLowering(Variable *Arg, Variable *FramePtr,
@@ skipping 449 matching lines @@
 
 protected:
   explicit TargetDataX8632(GlobalContext *Ctx);
 
 private:
   void lowerGlobal(const VariableDeclaration &Var) const;
   ~TargetDataX8632() override {}
   template <typename T> static void emitConstantPool(GlobalContext *Ctx);
 };
 
-template <> void ConstantInteger32::emit(GlobalContext *Ctx) const;
-template <> void ConstantInteger64::emit(GlobalContext *Ctx) const;
-template <> void ConstantFloat::emit(GlobalContext *Ctx) const;
-template <> void ConstantDouble::emit(GlobalContext *Ctx) const;
-
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX8632_H