Move some flag-like props from GlobalContext and TargetLowering to ClFlags.

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 53 matching lines @@
   // 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,
                               size_t BasicFrameOffset, size_t &InArgsSizeBytes);
   Operand *loOperand(Operand *Operand);
   Operand *hiOperand(Operand *Operand);
   x86::Address stackVarToAsmOperand(const Variable *Var) const;
 
   enum X86InstructionSet {
+    Begin,
     // SSE2 is the PNaCl baseline instruction set.
-    SSE2,
-    SSE4_1
+    SSE2 = Begin,
+    SSE4_1,
+    End
   };
 
   X86InstructionSet getInstructionSet() const { return InstructionSet; }
 
 protected:
   explicit TargetX8632(Cfg *Func);
 
   void postLower() override;
 
   void lowerAlloca(const InstAlloca *Inst) override;
@@ skipping 437 matching lines @@
 };
 
 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