removed git checkout script

on the SSD Jenkins is fast enough

Jenkins/master-windows-pipeline/Jenkinsfile

@@ -37,7 +37,6 @@ pipeline {
                     git url: 'https://github.com/google/llvm-premerge-checks.git'
                 }
                 echo "getting llvm-project... "
-                //powershell "${SCRIPT_DIR}/git_checkout.ps1"
                 dir("llvm-project")
                 {
                     git url: 'https://github.com/llvm/llvm-project.git'

scripts/git_checkout.ps1

@@ -1,32 +0,0 @@
-# Copyright 2019 Google LLC
-
-# Licensed under the the Apache License v2.0 with LLVM Exceptions (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-
-#     https://llvm.org/LICENSE.txt
-
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-. ${PSScriptRoot}\common.ps1
-
-if (Test-Path -PathType Container "llvm-project"){
-    Set-Location llvm-project
-    Write-Output "performing git pull..."
-    $branch = (git branch) | Out-String
-    $branch = ($branch -split '\r')[0]
-    if ($branch -ne "* master"){
-        Invoke-Call -ScriptBlock { git checkout master}
-    }
-    Invoke-Call -ScriptBlock { git reset --hard }
-    Invoke-Call -ScriptBlock { git clean -fdx }
-    Invoke-Call -ScriptBlock { git pull -q }
-    # TODO: in case of errors: delete folder and clone
-} else {
-    Write-Output "performing git clone..."
-    Invoke-Call -ScriptBlock { git clone -q --depth 1 https://github.com/llvm/llvm-project }
-}