Fix MSVC build after 289461; MSVC isn't sure if this is std:: or llvm::

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289480 91177308-0d34-0410-b5e6-96231b3b80d8

Author: nico

lib/Bitcode/Reader/MetadataLoader.cpp

@@ -1280,8 +1280,8 @@ MetadataLoader::~MetadataLoader() = default;
 MetadataLoader::MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
                                BitcodeReaderValueList &ValueList,
                                std::function<Type *(unsigned)> getTypeByID)
-    : Pimpl(make_unique<MetadataLoaderImpl>(Stream, TheModule, ValueList,
-                                            getTypeByID)) {}
+    : Pimpl(llvm::make_unique<MetadataLoaderImpl>(Stream, TheModule, ValueList,
+                                                  getTypeByID)) {}
 
 Error MetadataLoader::parseMetadata(bool ModuleLevel) {
   return Pimpl->parseMetadata(ModuleLevel);