Dumpers: Fix dumper for QVariant holding QList for old GDB

Change-Id: Id34806f06546ad9a6618f9b9431143465a988c1d
Reviewed-by: hjk <hjk121@nokiamail.com>
dumpers: Fix QHash<int,...> dumper for Qt4

In Qt4 (u)int hashs are optimized and the key is inside an
anonymous union, so, at least with LLDB, we cannot reference
"key" directly as a child of the QHashNode

Change-Id: Id7cac3d08fa85af599f2b2564a6b1f11b465c7b2
Reviewed-by: hjk <hjk121@nokiamail.com>