[new compiler] Fix crash in qml delegate model
[new compiler] Fix crash in qml delegate model

qmlContext(this) is expected in re-implementations of classBegin(), so just
like the VME we have to be careful that we call it after setting the context
on the ddata.

Change-Id: I38ad8d1a4e4093368f62f9d57718de3b8cd0cfd2
Reviewed-by: Lars Knoll <a812617a4072dcbeb80684eca0f369f0083af109@digia.com>

mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,qmlc/qtdeclarative,qmlc/qtdeclarative,mgrunditz/qtdeclarative-2d,qmlc/qtdeclarative,qmlc/qtdeclarative