[flang] Flang relicensing changes for LLVM Apache 2.0 license

This changes the license information in many of the flang source files.
- Renamed LICENSE to LICENSE.txt.
- NVIDIA Copyright lines have been removed.
- Initial lines for files follow the LLVM coding convention (file name on the first line; Emacs mode information on the first line).
- License references have been replaced with the abridged LLVM text.
- License information was removed from the test files.
- No file header was placed on test files (these weren't in most LLVM test files).
- License information was added to documentation files where it was missing.

We did not add brief file summaries to the initial line.

See http://llvm.org/docs/DeveloperPolicy.html#new-llvm-project-license-framework
for a description of the new license.

See http://llvm.org/docs/CodingStandards.html#file-headers
for a description of the new LLVM standard file header.

Original-commit: flang-compiler/f18@add6cde7244b926ca457a1c74c21fea071b85329
Reviewed-on: https://github.com/flang-compiler/f18/pull/887

1 files changed, 7 insertions, 1 deletions

diff --git a/flang/documentation/f2018-grammar.txt b/flang/documentation/f2018-grammar.txt
index a995f7ee902b..5044cb0dded7 100644
--- a/flang/documentation/f2018-grammar.txt
+++ b/flang/documentation/f2018-grammar.txt
@@ -1,4 +1,10 @@
-# Copyright (c) 2018-2019, NVIDIA CORPORATION.  All rights reserved.
+#===-- documentation/f2018-grammar.txt -------------------------------------===#
+#
+# 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
+#
+#------------------------------------------------------------------------------#
 
 R0001 digit -> 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
 R0002 letter ->