First patch for Mips subzero compiler

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4167

Move issue https://codereview.chromium.org/1159823004/ here so that
it's under the proper email.

Review URL: https://codereview.chromium.org/1169533003
diff --git a/src/IceInstMIPS32.h b/src/IceInstMIPS32.h
new file mode 100644
index 0000000..0c7c2d8
--- /dev/null
+++ b/src/IceInstMIPS32.h
@@ -0,0 +1,28 @@
+//===- subzero/src/IceInstMIPS32.h - MIPS32 machine instrs --*- 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 InstMIPS32 and OperandMIPS32 classes and
+// their subclasses.  This represents the machine instructions and
+// operands used for MIPS32 code selection.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_ICEINSTMIPS32_H
+#define SUBZERO_SRC_ICEINSTMIPS32_H
+
+#include "IceDefs.h"
+
+namespace Ice {
+
+class TargetMIPS32;
+// Fill this in.
+
+} // end of namespace Ice
+
+#endif // SUBZERO_SRC_ICEINSTMIPS32_H