CommandLine: implement debug streaming operator

Change-Id: I09a47d70d5bea315efa1af505f7afc69c8075310
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/commandline.cpp

@@ -34,6 +34,12 @@
 #include <QRegularExpression>
 #include <QStack>
 
+QT_BEGIN_NAMESPACE
+QDebug operator<<(QDebug dbg, const Utils::CommandLine &cmd)
+{
+    return dbg << cmd.toUserOutput();
+}
+QT_END_NAMESPACE
 
 // The main state of the Unix shell parser
 enum MxQuoting { MxBasic, MxSingleQuote, MxDoubleQuote, MxParen, MxSubst, MxGroup, MxMath };

src/libs/utils/commandline.h

@@ -171,4 +171,8 @@ private:
 
 } // namespace Utils
 
+QT_BEGIN_NAMESPACE
+QTCREATOR_UTILS_EXPORT QDebug operator<<(QDebug dbg, const Utils::CommandLine &cmd);
+QT_END_NAMESPACE
+
 Q_DECLARE_METATYPE(Utils::CommandLine)