Add Om1 lowering with no optimizations

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 25c384a01a35d79c6ebaafcf2fca6c156a666fcb..6c5cb1aad606f59738c03ed443e8c9097713d7c3 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -35,16 +35,23 @@
 #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.