Implement MachOObjectFile::is64Bit directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178996 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Object/MachOObjectFile.cpp b/lib/Object/MachOObjectFile.cpp
index ee42bc8..7bb8c19 100644
--- a/lib/Object/MachOObjectFile.cpp
+++ b/lib/Object/MachOObjectFile.cpp
@@ -55,7 +55,8 @@
 }
 
 bool MachOObjectFile::is64Bit() const {
-  return MachOObj->is64Bit();
+  StringRef Magic = getData(0, 4);
+  return (Magic == "\xFE\xED\xFA\xCF") || (Magic == "\xCF\xFA\xED\xFE");
 }
 
 const MachOFormat::LoadCommand *