[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/Analysis/IndirectCallPromotionAnalysis.cpp b/llvm/lib/Analysis/IndirectCallPromotionAnalysis.cpp
index 6ff840e..68153de 100644
--- a/llvm/lib/Analysis/IndirectCallPromotionAnalysis.cpp
+++ b/llvm/lib/Analysis/IndirectCallPromotionAnalysis.cpp
@@ -53,7 +53,7 @@
                               "call callsite"));
 
 ICallPromotionAnalysis::ICallPromotionAnalysis() {
-  ValueDataArray = llvm::make_unique<InstrProfValueData[]>(MaxNumPromotions);
+  ValueDataArray = std::make_unique<InstrProfValueData[]>(MaxNumPromotions);
 }
 
 bool ICallPromotionAnalysis::isPromotionProfitable(uint64_t Count,