Distinguish between ELF 32/64, little/big endian, in the type system of Binary.h

lib/Object/Archive.cpp

 //===- Archive.cpp - ar File Format implementation --------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines the ArchiveObjectFile class.
@@ skipping 156 matching lines @@
 error_code Archive::Child::getAsBinary(OwningPtr<Binary> &Result) const {
   OwningPtr<Binary> ret;
   if (error_code ec =
     createBinary(getBuffer(), ret))
     return ec;
   Result.swap(ret);
   return object_error::success;
 }
 
 Archive::Archive(MemoryBuffer *source, error_code &ec)
-  : Binary(Binary::isArchive, source) {
+  : Binary(Binary::ID_Archive, source) {
   // Check for sufficient magic.
   if (!source || source->getBufferSize()
                  < (8 + sizeof(ArchiveMemberHeader) + 2) // Smallest archive.
               || StringRef(source->getBufferStart(), 8) != Magic) {
     ec = object_error::invalid_file_type;
     return;
   }
 
   // Get the special members.
   child_iterator i = begin_children(false);
@@ skipping 75 matching lines @@
 }
 
 Archive::symbol_iterator Archive::end_symbols() const {
   const char *buf = SymbolTable->getBuffer()->getBufferStart();
   uint32_t member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
   buf += 4 + (member_count * 4); // Skip offsets.
   uint32_t symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
   return symbol_iterator(
     Symbol(this, symbol_count, 0));
 }