Replace OwningPtr<T> with std::unique_ptr<T>.

This compiles with no changes to clang/lld/lldb with MSVC and includes
overloads to various functions which are used by those projects and llvm
which have OwningPtr's as parameters. This should allow out of tree
projects some time to move. There are also no changes to libs/Target,
which should help out of tree targets have time to move, if necessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203083 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Object/MachOUniversal.cpp

@@ -72,7 +72,7 @@ MachOUniversalBinary::ObjectForArch::ObjectForArch(
 }
 
 error_code MachOUniversalBinary::ObjectForArch::getAsObjectFile(
-    OwningPtr<ObjectFile> &Result) const {
+    std::unique_ptr<ObjectFile> &Result) const {
   if (Parent) {
     StringRef ParentData = Parent->getData();
     StringRef ObjectData = ParentData.substr(Header.offset, Header.size);
@@ -95,7 +95,8 @@ void MachOUniversalBinary::anchor() { }
 ErrorOr<MachOUniversalBinary *>
 MachOUniversalBinary::create(MemoryBuffer *Source) {
   error_code EC;
-  OwningPtr<MachOUniversalBinary> Ret(new MachOUniversalBinary(Source, EC));
+  std::unique_ptr<MachOUniversalBinary> Ret(
+      new MachOUniversalBinary(Source, EC));
   if (EC)
     return EC;
   return Ret.release();
@@ -134,9 +135,8 @@ static bool getCTMForArch(Triple::ArchType Arch, MachO::CPUType &CTM) {
   }
 }
 
-error_code
-MachOUniversalBinary::getObjectForArch(Triple::ArchType Arch,
-                                       OwningPtr<ObjectFile> &Result) const {
+error_code MachOUniversalBinary::getObjectForArch(
+    Triple::ArchType Arch, std::unique_ptr<ObjectFile> &Result) const {
   MachO::CPUType CTM;
   if (!getCTMForArch(Arch, CTM))
     return object_error::arch_not_found;