[Clang] Migrate llvm::make_unique to std::make_unique

Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of (hopefully) all the llvm::make_unique instances across the monorepo.

Differential revision: https://reviews.llvm.org/D66259

llvm-svn: 368942
diff --git a/clang/lib/Serialization/PCHContainerOperations.cpp b/clang/lib/Serialization/PCHContainerOperations.cpp
index 00063d6..d4990fc 100644
--- a/clang/lib/Serialization/PCHContainerOperations.cpp
+++ b/clang/lib/Serialization/PCHContainerOperations.cpp
@@ -54,7 +54,7 @@
     CompilerInstance &CI, const std::string &MainFileName,
     const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,
     std::shared_ptr<PCHBuffer> Buffer) const {
-  return llvm::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);
+  return std::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);
 }
 
 StringRef
@@ -63,6 +63,6 @@
 }
 
 PCHContainerOperations::PCHContainerOperations() {
-  registerWriter(llvm::make_unique<RawPCHContainerWriter>());
-  registerReader(llvm::make_unique<RawPCHContainerReader>());
+  registerWriter(std::make_unique<RawPCHContainerWriter>());
+  registerReader(std::make_unique<RawPCHContainerReader>());
 }