Debugger: Adjust LLDB bitfield dumper test

Looks like LLDB 300.2 doesn't produce the :<size> anymore.

Change-Id: I18d0e66736beb109e9d76da62b73a4d0dd4f38db
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Split off non-working LLDB virtual inheritance test

Change-Id: I78f2ad9e46c88302d523b879558f65b4a86b0e2c
Reviewed-by: hjk <hjk121@nokiamail.com>