- Adding a relaunch feature to the performance tester: you can use the relaunch if you want to measure multiple runs of your app keeping the same metrics alive. New arguments must be supplied - and the step counter will not be reset (this makes it easy to avoid endless loops)
- Having the Sketch test case relaunch itself

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@179548 91177308-0d34-0410-b5e6-96231b3b80d8
Enabling test case to write the average+stddev pair to the results
The sketch test case writes avg+stddev for all its metrics:
	<key>fetch-frames</key>
	<dict>
		<key>description</key>
		<string>time to dump backtrace for every frame in every thread</string>
		<key>stddev</key>
		<real>0.006270938361432314</real>
		<key>value</key>
		<real>0.011568079851851851</real>
	</dict>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@179550 91177308-0d34-0410-b5e6-96231b3b80d8