Print VS info during the build (#14831)

Author: psfinaki

azure-pipelines.yml

@@ -349,6 +349,10 @@ stages:
           steps:
           - checkout: self
             clean: true
+
+          - powershell: eng\SetupVSHive.ps1
+            displayName: Setup VS Hive
+
           - script: eng\CIBuild.cmd -compressallmetadata -configuration $(_configuration) -$(_testKind)
             displayName: Build / Test
           - task: PublishTestResults@2

eng/SetupVSHive.ps1

@@ -0,0 +1,18 @@
+. $PSScriptRoot\common\tools.ps1
+
+$vsInfo = LocateVisualStudio
+if ($null -eq $vsInfo) {
+  throw "Unable to locate required Visual Studio installation"
+}
+
+$vsDir = $vsInfo.installationPath.TrimEnd("\")
+
+$vsRegEdit = Join-Path (Join-Path (Join-Path $vsDir 'Common7') 'IDE') 'VSRegEdit.exe'
+
+$hive = "RoslynDev"
+&$vsRegEdit set "$vsDir" $hive HKCU "Roslyn\Internal\OnOff\Features" OOP64Bit dword 0
+
+Write-Host "-- VS Info --"
+$isolationIni = Join-Path (Join-Path (Join-Path $vsDir 'Common7') 'IDE') 'devenv.isolation.ini'
+Get-Content $isolationIni | Write-Host
+Write-Host "-- /VS Info --"