Subzero: Add necessary PNaCl files for standalone build.

src/IceInst.h

 //===- subzero/src/IceInst.h - High-level instructions ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 1118 matching lines @@
   mutable ilist_half_node<Ice::Inst> Sentinel;
 };
 
 } // end of namespace llvm
 
 namespace Ice {
 
 inline InstList::iterator instToIterator(Inst *Instr) {
 #ifdef PNACL_LLVM
   return Instr;
-#else // !PNACL_LLVM
+#else  // !PNACL_LLVM
   return Instr->getIterator();
 #endif // !PNACL_LLVM
 }
 
-inline Inst *iteratorToInst(InstList::iterator Iter) {
-  return &*Iter;
-}
+inline Inst *iteratorToInst(InstList::iterator Iter) { return &*Iter; }
 
 inline const Inst *iteratorToInst(InstList::const_iterator Iter) {
   return &*Iter;
 }
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINST_H