[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/Transforms/Instrumentation/IndirectCallPromotion.cpp b/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
index c7371f5..74d6e76 100644
--- a/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
+++ b/llvm/lib/Transforms/Instrumentation/IndirectCallPromotion.cpp
@@ -403,7 +403,7 @@
           AM->getResult<FunctionAnalysisManagerModuleProxy>(M).getManager();
       ORE = &FAM.getResult<OptimizationRemarkEmitterAnalysis>(F);
     } else {
-      OwnedORE = llvm::make_unique<OptimizationRemarkEmitter>(&F);
+      OwnedORE = std::make_unique<OptimizationRemarkEmitter>(&F);
       ORE = OwnedORE.get();
     }