Get MSBuild performance summary

Author: dougbu

.azure/pipelines/ci.yml

@@ -133,6 +133,7 @@ stages:
                 -arch x64
                 -pack
                 -all
+                '/fileLoggerParameters:LogFile=artifacts/log/performance.x64.log;PerformanceSummary;Verbosity=Quiet'
                 $(_BuildArgs)
                 $(_InternalRuntimeDownloadArgs)
         displayName: Build x64
@@ -147,6 +148,7 @@ stages:
                 -all
                 -noBuildJava
                 /p:OnlyPackPlatformSpecificPackages=true
+                '/fileLoggerParameters:LogFile=artifacts/log/performance.x86.log;PerformanceSummary;Verbosity=Quiet'
                 $(_BuildArgs)
                 $(_InternalRuntimeDownloadArgs)
         displayName: Build x86