Subzero: Add necessary PNaCl files for standalone build.

src/IceInst.h

Index: src/IceInst.h
diff --git a/src/IceInst.h b/src/IceInst.h
index 769d40584b5d0066a72580eba0dff3e14c1d49a7..36b8810a82bcbf0390e66283285f6cde91763239 100644
--- a/src/IceInst.h
+++ b/src/IceInst.h
@@ -1136,14 +1136,12 @@ 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;