Simplify creation of a bunch of ArrayRefs by using None, makeArrayRef or just letting them be implicitly created.

llvm-svn: 216525
diff --git a/llvm/lib/Support/StringRef.cpp b/llvm/lib/Support/StringRef.cpp
index 0da9d5f..ddece08 100644
--- a/llvm/lib/Support/StringRef.cpp
+++ b/llvm/lib/Support/StringRef.cpp
@@ -105,8 +105,8 @@
                                   bool AllowReplacements,
                                   unsigned MaxEditDistance) const {
   return llvm::ComputeEditDistance(
-      llvm::ArrayRef<char>(data(), size()),
-      llvm::ArrayRef<char>(Other.data(), Other.size()),
+      makeArrayRef(data(), size()),
+      makeArrayRef(Other.data(), Other.size()),
       AllowReplacements, MaxEditDistance);
 }