Merge pull request #21260 from dotnet/updatePerfScript

Reference the correct cibuild script

build/scripts/run_perf.ps1

@@ -16,7 +16,7 @@ Invoke-WebRequest -Uri http://dotnetci.blob.core.windows.net/roslyn-perf/cpc.zip
 [Reflection.Assembly]::LoadWithPartialName('System.IO.Compression.FileSystem') | Out-Null
 [IO.Compression.ZipFile]::ExtractToDirectory('cpc.zip', $CPCLocation)
 
-./build/scripts/cibuild.ps1 -release -testPerfRun
+./build/scripts/cibuild.cmd -release -testPerfRun
 
 if ( -not $? )
 {