Add Om1 lowering with no optimizations

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declaraions -------*- 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 various useful types and classes that have
@@ skipping 17 matching lines @@
 #include <vector>
 
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/SmallBitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/Compiler.h" // LLVM_STATIC_ASSERT
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/Timer.h"
 
+// Roll our own static_assert<> in the absence of C++11.  TODO: change
+// to static_assert<> with C++11.
+template <bool> struct staticAssert;
+template <> struct staticAssert<true> {}; // only true is defined
+#define STATIC_ASSERT(x) staticAssert<(x)>()
+
 namespace Ice {
 
+class Cfg;
 class CfgNode;
 class Constant;
 class GlobalContext;
-class Cfg;
 class Inst;
 class InstPhi;
 class InstTarget;
 class Operand;
+class TargetLowering;
 class Variable;
 
 // TODO: Switch over to LLVM's ADT container classes.
 // http://llvm.org/docs/ProgrammersManual.html#picking-the-right-data-structure-for-a-task
 typedef std::string IceString;
 typedef std::list<Inst *> InstList;
 typedef std::list<InstPhi *> PhiList;
 typedef std::vector<Variable *> VarList;
 typedef std::vector<CfgNode *> NodeList;
 
@@ skipping 55 matching lines @@
 
 private:
   const llvm::TimeRecord Start;
   Timer(const Timer &) LLVM_DELETED_FUNCTION;
   Timer &operator=(const Timer &) LLVM_DELETED_FUNCTION;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H