Stack size calculation does not work for machines where stack grows up

On machines where the stack grows upwards (i.e. HPPA) the stack limit calculation does not work (qtdeclarative/src/qml/jsruntime/qv4engine.cpp). The stackBottom is the origin of the stack on this machines, not the limit. Checking if the stack grows up or down should be simply doing:

if (reinterpret_cast<quintptr>(&stackBottom) < reinterpret_cast<quintptr>(&stackSize))

Since these machines are a rare edge case I suggest to simply assume the stack is big enough on them. In fact qmlviewer seems to work if this check is removed.