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

tools/lli/lli.cpp

@@ -284,7 +284,7 @@ public:
     if (!getCacheFilename(ModuleID, CacheName))
       return NULL;
     // Load the object from the cache filename
-    OwningPtr<MemoryBuffer> IRObjectBuffer;
+    std::unique_ptr<MemoryBuffer> IRObjectBuffer;
     MemoryBuffer::getFile(CacheName.c_str(), IRObjectBuffer, -1, false);
     // If the file isn't there, that's OK.
     if (!IRObjectBuffer)
@@ -537,7 +537,7 @@ int main(int argc, char **argv, char * const *envp) {
   }
 
   for (unsigned i = 0, e = ExtraArchives.size(); i != e; ++i) {
-    OwningPtr<MemoryBuffer> ArBuf;
+    std::unique_ptr<MemoryBuffer> ArBuf;
     error_code ec;
     ec = MemoryBuffer::getFileOrSTDIN(ExtraArchives[i], ArBuf);
     if (ec) {
@@ -662,7 +662,7 @@ int main(int argc, char **argv, char * const *envp) {
     // address space, assign the section addresses to resolve any relocations,
     // and send it to the target.
 
-    OwningPtr<RemoteTarget> Target;
+    std::unique_ptr<RemoteTarget> Target;
     if (!ChildExecPath.empty()) { // Remote execution on a child process
 #ifndef LLVM_ON_UNIX
       // FIXME: Remove this pointless fallback mode which causes tests to "pass"