Debugger: split fixCppExpression into some common and some cdb part

Task-number: QTCREATORBUG-8446
Change-Id: I79abc7f75779db15bd8700c085b9cd57411bb2e1
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/plugins/debugger/watchutils.h

@@ -120,6 +120,7 @@ QString quoteUnprintableLatin1(const QByteArray &ba);
 bool isCppEditor(Core::IEditor *editor);
 QString cppExpressionAt(TextEditor::ITextEditor *editor, int pos,
                         int *line, int *column, QString *function = 0);
+QString removeObviousSideEffects(const QString &exp);
 QString fixCppExpression(const QString &exp);
 QString cppFunctionAt(const QString &fileName, int line);
 // Decode string data as returned by the dumper helpers.