Debugger: Move special argv display to DumperBase and use for LLDB, too

Change-Id: Ie1913f5a5062d230e02a4f1738ca14bd6cebc55c
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Added test for Abi::abiFromTargetTriplet()

Task-number: QTCREATORBUG-11409

Change-Id: I176c38dccdc1af6fde4298d6413fe827f27cc4b0
Reviewed-by: hjk <hjk121@nokiamail.com>