Valgrind: Announce 'started', not 'stopped' on startup

Also provide a name for the workers.

Change-Id: I323c498db1eeb8225170aae080fdf084aa53e14a
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/valgrind/callgrindengine.cpp

@@ -42,6 +42,7 @@ using namespace Valgrind::Internal;
 CallgrindToolRunner::CallgrindToolRunner(ProjectExplorer::RunControl *runControl)
     : ValgrindToolRunner(runControl)
 {
+    setDisplayName("CallgrindToolRunner");
     connect(&m_runner, &Callgrind::CallgrindRunner::finished,
             this, &CallgrindToolRunner::slotFinished);
     connect(m_runner.parser(), &Callgrind::Parser::parserDataReady,