[llvm] Ensure newlines at the end of files (NFC)

This patch eliminates pesky "No newline at end of file" messages from
git diff.

llvm/lib/Analysis/TypeBasedAliasAnalysis.cpp

@@ -817,4 +817,4 @@ MDNode *AAMDNodes::ShiftTBAAStruct(MDNode *MD, size_t Offset) {
     Sub.push_back(MD->getOperand(i + 2));
   }
   return MDNode::get(MD->getContext(), Sub);
-}
+}

llvm/lib/Support/SHA256.cpp

@@ -288,4 +288,4 @@ std::array<uint8_t, 32> SHA256::hash(ArrayRef<uint8_t> Data) {
   return Arr;
 }
 
-} // namespace llvm
+} // namespace llvm