[vcpkg] Add LLVM 10 to Windows CI machines for microsoft#11655

scripts/azure-pipelines/windows/provision-image.txt

@@ -118,6 +118,7 @@ $WindowsSDKUrl = 'https://download.microsoft.com/download/1/c/3/1c3d5161-d9e9-4e
 $WindowsWDKUrl = 'https://download.microsoft.com/download/1/a/7/1a730121-7aa7-46f7-8978-7db729aa413d/wdk/wdksetup.exe'
 
 $MpiUrl = 'https://download.microsoft.com/download/a/5/2/a5207ca5-1203-491a-8fb8-906fd68ae623/msmpisetup.exe'
+$LlvmUrl = 'https:/llvm/llvm-project/releases/download/llvmorg-10.0.0/LLVM-10.0.0-win64.exe'
 
 $CudaUrl = 'https://developer.download.nvidia.com/compute/cuda/10.1/Prod/local_installers/cuda_10.1.243_426.00_win10.exe'
 $CudaFeatures = 'nvcc_10.1 cuobjdump_10.1 nvprune_10.1 cupti_10.1 gpu_library_advisor_10.1 memcheck_10.1 ' + `
@@ -353,6 +354,30 @@ Function InstallWindowsWDK {
  }
 }
 
+<#
+.SYNOPSIS
+Installs LLVM.
+
+.DESCRIPTION
+InstallLLVM installs LLVM from the supplied URL.
+
+.PARAMETER Url
+The URL of the LLVM installer.
+#>
+Function InstallLLVM {
+ try {
+ Write-Host 'Downloading LLVM...'
+ [string]$installerPath = Get-TempFilePath -Extension 'exe'
+ curl.exe -L -o $installerPath -s -S $Url
+ Write-Host 'Installing LLVM...'
+ $proc = Start-Process -FilePath $installerPath -ArgumentList @('/S') -NoNewWindow -Wait -PassThru
+ PrintMsiExitCodeMessage $proc.ExitCode
+ }
+ catch {
+ Write-Error "Failed to install LLVM! $($_.Exception.Message)"
+ }
+}
+
 <#
 .SYNOPSIS
 Installs MPI
@@ -449,6 +474,7 @@ if ($null -eq $av) {
 InstallVisualStudio -Workloads $Workloads -BootstrapperUrl $VisualStudioBootstrapperUrl -Nickname 'Stable'
 InstallWindowsSDK -Url $WindowsSDKUrl
 InstallWindowsWDK -Url $WindowsWDKUrl
+InstallLLVM $LlvmUrl
 InstallMpi -Url $MpiUrl
 InstallCuda -Url $CudaUrl -Features $CudaFeatures
 InstallZip -Url $BinSkimUrl -Name 'BinSkim' -Dir 'C:\BinSkim'