Minor improvements

Author: boomanaiden154

.github/workflows/premerge.yaml

@@ -12,6 +12,9 @@ jobs:
   premerge-checks-linux:
     if: github.repository_owner == 'llvm'
     runs-on: llvm-premerge-linux-runners
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number }}
+      cancel-in-progress: true
     container:
       image: ghcr.io/keenuts-test-org/linux-ci-testing:latest
     defaults:
@@ -22,6 +25,8 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 2
+      - name: Setup ccache
+        uses: hendrikmuhs/[email protected]
       - name: Build and Test
         run: |
           git config --global --add safe.directory '*'

llvm/tools/llvm-exegesis/llvm-exegesis.cpp

@@ -1,5 +1,4 @@
 //===-- llvm-exegesis.cpp ---------------------------------------*- C++ -*-===//
-//
 // 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