Create a proper target machine for PNaCl.

lib/Target/PNaCl/TargetInfo/PNaClTargetInfo.cpp

-//===- JSBackendMCTargetDesc.h - JS Backend Target Descriptions -*- C++ -*-===//
+//===-- llvm/Target/PNaCl/PNaClTargetMachine.h - Target Information -*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
-// This file provides asm.js specific target descriptions.
+// This file defines the TargetMachine class specific to PNaCl.
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef JSBACKENDMCTARGETDESC_H
-#define JSBACKENDMCTARGETDESC_H
-
 #include "llvm/Support/TargetRegistry.h"
 
 namespace llvm {
+  Target PNaClLe32_Target;
+}
 
-extern Target TheJSBackendTarget;
+using namespace llvm;
 
-} // End llvm namespace
-
-#endif
+extern "C" void LLVMInitializePNaClTargetInfo() {
+  RegisterTarget<Triple::le32, false>
+    X(PNaClLe32_Target, "le32", "The PNaCl/Emscripten target.");
+}