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

src/IceTypes.h

 //===- subzero/src/IceTypes.h - Primitive ICE types -------------*- 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 a few properties of the primitive types allowed
@@ skipping 22 matching lines @@
 #undef X
       TargetArch_NUM
 };
 
 const char *targetArchString(TargetArch Arch);
 
 inline Ostream &operator<<(Ostream &Stream, TargetArch Arch) {
   return Stream << targetArchString(Arch);
 }
 
+// The list of all target instruction sets. Individual targets will
+// map this to include only what is valid for the target.
+enum TargetInstructionSet {
+  X86InstructionSet_Begin,
+  // SSE2 is the PNaCl baseline instruction set.
+  X86InstructionSet_SSE2 = X86InstructionSet_Begin,
+  X86InstructionSet_SSE4_1,
+  X86InstructionSet_End,
+};
+
 enum OptLevel { Opt_m1, Opt_0, Opt_1, Opt_2 };
 
 size_t typeWidthInBytes(Type Ty);
 size_t typeAlignInBytes(Type Ty);
 size_t typeNumElements(Type Ty);
 Type typeElementType(Type Ty);
 const char *typeString(Type Ty);
 
 inline Type getPointerType() { return IceType_i32; }
 
@@ skipping 85 matching lines @@
 };
 
 inline Ostream &operator<<(Ostream &Stream, const FuncSigType &Sig) {
   Sig.dump(Stream);
   return Stream;
 }
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETYPES_H