[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/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp b/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
index a91dd4e..75ddbc3 100644
--- a/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/CompileOnDemandLayer.cpp
@@ -155,7 +155,7 @@
   // Create a partitioning materialization unit and lodge it with the
   // implementation dylib.
   if (auto Err = PDR.getImplDylib().define(
-          llvm::make_unique<PartitioningIRMaterializationUnit>(
+          std::make_unique<PartitioningIRMaterializationUnit>(
               ES, std::move(TSM), R.getVModuleKey(), *this))) {
     ES.reportError(std::move(Err));
     R.failMaterialization();
@@ -267,7 +267,7 @@
 
   // If the partition is empty, return the whole module to the symbol table.
   if (GVsToExtract->empty()) {
-    R.replace(llvm::make_unique<PartitioningIRMaterializationUnit>(
+    R.replace(std::make_unique<PartitioningIRMaterializationUnit>(
         std::move(TSM), R.getSymbols(), std::move(Defs), *this));
     return;
   }
@@ -310,7 +310,7 @@
     return;
   }
 
-  R.replace(llvm::make_unique<PartitioningIRMaterializationUnit>(
+  R.replace(std::make_unique<PartitioningIRMaterializationUnit>(
       ES, std::move(TSM), R.getVModuleKey(), *this));
   BaseLayer.emit(std::move(R), std::move(*ExtractedTSM));
 }