[mlir][llvm] Add missing license header (NFC)

This commit adds a missing license header that was forgotten in
https://reviews.llvm.org/D143064.

diff --git a/mlir/lib/Target/LLVMIR/LoopAnnotationTranslation.cpp b/mlir/lib/Target/LLVMIR/LoopAnnotationTranslation.cpp
index 273dc13..b8b6e3c 100644 (file)
--- a/mlir/lib/Target/LLVMIR/LoopAnnotationTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/LoopAnnotationTranslation.cpp
@@ -1,3 +1,11 @@
+//===- LoopAnnotationTranslation.cpp - Loop annotation export -------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
 #include "LoopAnnotationTranslation.h"
 
 using namespace mlir;