Update Subzero to start parsing PNaCl bitcode files.

src/PNaClTranslator.h

+//===- subzero/src/PNaClTranslator.h - Builds ICE from PNaCl bitcode ------===//
+//
+//                        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 PNaCl bitcode file to ICE to machine code translator.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUBZERO_SRC_PNACLTRANSLATOR_H
+#define SUBZERO_SRC_PNACLTRANSLATOR_H
+
+#include "IceTranslator.h"
+#include <string>
+
+namespace Ice {
+
+class PNaClTranslator : Translator {
+public:
+  PNaClTranslator(Ice::GlobalContext *Ctx, Ice::ClFlags &Flags)
+      : Translator(Ctx, Flags) {}
+  // Reads the PNaCl bitcode file and translates to ICE. Returns exit
+  // status 0 if successful. Nonzero otherwise.
+  int translate(const std::string &IRFilename);
+};
+
+}
+
+#endif  // SUBZERO_SRC_PNACLTRANSLATOR_H