debugger: add dumper for boost::optional

tests/manual/gdbdebugger/boost/boost.pro

@@ -0,0 +1,5 @@
+TARGET = boost
+CONFIG += qt
+DEPENDPATH += .
+INCLUDEPATH += .
+SOURCES += main.cpp

tests/manual/gdbdebugger/boost/main.cpp

@@ -0,0 +1,31 @@
+
+#include <boost/optional.hpp>
+
+using namespace boost;
+
+struct Large
+{
+    Large() { d1 = d2 = d3 = d4 = d5 = 0; }
+
+    double d1;
+    double d2;
+    double d3;
+    double d4;
+    double d5;
+};
+
+void testOptional()
+{
+    optional<int> i;
+    optional<double> d;
+    optional<Large> l;
+    i = 1;
+    l = Large();
+    i = 2;
+    i = 3;
+}
+
+int main()
+{
+    testOptional();
+}