Replace wrongly deleted header banner, fix formatting

I reviewed the diff hunks of 05da2fe52162c80dfa that don't contain
'#include' lines, and found two unintended changes. I deleted a header
banner inadvertently while inserting a header, and changed the
indentation of a constructor in an odd way. Add back the banner, and
reformat the constructor.

1 files changed, 13 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/PostRAHazardRecognizer.cpp b/llvm/lib/CodeGen/PostRAHazardRecognizer.cpp
index a2c8c757222..4f88f4d3dd6 100644
--- a/llvm/lib/CodeGen/PostRAHazardRecognizer.cpp
+++ b/llvm/lib/CodeGen/PostRAHazardRecognizer.cpp
@@ -1,3 +1,16 @@
+//===----- PostRAHazardRecognizer.cpp - hazard recognizer -----------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// This runs the hazard recognizer and emits noops when necessary.  This
+/// gives targets a way to run the hazard recognizer without running one of
+/// the schedulers.  Example use cases for this pass would be:
+///
 /// - Targets that need the hazard recognizer to be run at -O0.
 /// - Targets that want to guarantee that hazards at the beginning of
 ///   scheduling regions are handled correctly.  The post-RA scheduler is