[llvm] 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.

llvm-svn: 369013
diff --git a/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp b/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
index d312930..23dde7d 100644
--- a/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
+++ b/llvm/tools/llvm-objcopy/MachO/MachOReader.cpp
@@ -188,7 +188,7 @@
                    StrTable,
                    MachOObj.getSymbolTableEntry(Symbol.getRawDataRefImpl())));
 
-    O.SymTable.Symbols.push_back(llvm::make_unique<SymbolEntry>(SE));
+    O.SymTable.Symbols.push_back(std::make_unique<SymbolEntry>(SE));
   }
 }
 
@@ -223,7 +223,7 @@
 }
 
 std::unique_ptr<Object> MachOReader::create() const {
-  auto Obj = llvm::make_unique<Object>();
+  auto Obj = std::make_unique<Object>();
   readHeader(*Obj);
   readLoadCommands(*Obj);
   readSymbolTable(*Obj);