[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/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 9c18d69..00180d9 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -903,7 +903,7 @@
 static std::unique_ptr<TypeExpansion>
 getTypeExpansion(QualType Ty, const ASTContext &Context) {
   if (const ConstantArrayType *AT = Context.getAsConstantArrayType(Ty)) {
-    return llvm::make_unique<ConstantArrayExpansion>(
+    return std::make_unique<ConstantArrayExpansion>(
         AT->getElementType(), AT->getSize().getZExtValue());
   }
   if (const RecordType *RT = Ty->getAs<RecordType>()) {
@@ -947,13 +947,13 @@
         Fields.push_back(FD);
       }
     }
-    return llvm::make_unique<RecordExpansion>(std::move(Bases),
+    return std::make_unique<RecordExpansion>(std::move(Bases),
                                               std::move(Fields));
   }
   if (const ComplexType *CT = Ty->getAs<ComplexType>()) {
-    return llvm::make_unique<ComplexExpansion>(CT->getElementType());
+    return std::make_unique<ComplexExpansion>(CT->getElementType());
   }
-  return llvm::make_unique<NoExpansion>();
+  return std::make_unique<NoExpansion>();
 }
 
 static int getExpansionSize(QualType Ty, const ASTContext &Context) {