Add Om1 lowering with no optimizations

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
 // in Subzero.  Every Subzero source file is expected to include
 // IceTypes.h.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICETYPES_H
 #define SUBZERO_SRC_ICETYPES_H
 
 #include "IceTypes.def"
 
 namespace Ice {
 
 enum Type {
 #define X(tag, size, align, str) tag,
   ICETYPE_TABLE
 #undef X
 };
 
+enum TargetArch {
+  Target_X8632,
+  Target_X8664,
+  Target_ARM32,
+  Target_ARM64
+};
+
+enum OptLevel {
+  Opt_m1,
+  Opt_0,
+  Opt_1,
+  Opt_2
+};
+
 size_t typeWidthInBytes(Type Ty);
 size_t typeAlignInBytes(Type Ty);
 
 template <> Ostream &operator<<(class Ostream &Str, const Type &Ty);
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETYPES_H