Valgrind: Allow specifying extra arguments to valgrind etc

Fixes: QTCREATORBUG-18693
Change-Id: Ibb968dcd82b118340a45329b4a14b28d85700661
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/valgrind/callgrindengine.cpp

@@ -35,6 +35,7 @@
 #include <debugger/analyzer/analyzermanager.h>
 
 #include <utils/qtcassert.h>
+#include <utils/qtcprocess.h>
 
 using namespace ProjectExplorer;
 using namespace Valgrind::Callgrind;
@@ -96,6 +97,8 @@ QStringList CallgrindToolRunner::toolArguments() const
     if (!m_argumentForToggleCollect.isEmpty())
         arguments << m_argumentForToggleCollect;
 
+    arguments << Utils::QtcProcess::splitArgs(m_settings.callgrindArguments());
+
     return arguments;
 }