[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/LazyBranchProbabilityInfo.cpp b/llvm/lib/Analysis/LazyBranchProbabilityInfo.cpp
index f2592c2..7fd61b4 100644
--- a/llvm/lib/Analysis/LazyBranchProbabilityInfo.cpp
+++ b/llvm/lib/Analysis/LazyBranchProbabilityInfo.cpp
@@ -56,7 +56,7 @@
 bool LazyBranchProbabilityInfoPass::runOnFunction(Function &F) {
   LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
   TargetLibraryInfo &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI();
-  LBPI = llvm::make_unique<LazyBranchProbabilityInfo>(&F, &LI, &TLI);
+  LBPI = std::make_unique<LazyBranchProbabilityInfo>(&F, &LI, &TLI);
   return false;
 }