Subzero: Add necessary PNaCl files for standalone build.

src/IceBitVector.h

 //===- subzero/src/IceBitVector.h - Inline bit vector. ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 245 matching lines @@
                 "Unsupported word size");
 
   BitWord *Bits;     // Actual bits.
   unsigned Size;     // Size of bitvector in bits.
   unsigned Capacity; // Size of allocated memory in BitWord.
   Allocator Alloc;
 
   uint64_t alignTo(uint64_t Value, uint64_t Align) {
 #ifdef PNACL_LLVM
     return llvm::RoundUpToAlignment(Value, Align);
-#else // !PNACL_LLVM
+#else  // !PNACL_LLVM
     return llvm::alignTo(Value, Align);
 #endif // !PNACL_LLVM
   }
 
 public:
   typedef unsigned size_type;
   // Encapsulation of a single bit.
   class reference {
     friend class BitVectorTmpl;
 
@@ skipping 544 matching lines @@
 
 namespace std {
 /// Implement std::swap in terms of BitVectorTmpl swap.
 template <template <typename> class AT>
 inline void swap(Ice::BitVectorTmpl<AT> &LHS, Ice::BitVectorTmpl<AT> &RHS) {
   LHS.swap(RHS);
 }
 }
 
 #endif // SUBZERO_SRC_ICEBITVECTOR_H