Remove lldb-repro which was used to run the test suite against a
reproducer. The corresponding functionality has been removed from LLDB
so there's no need for the tool anymore.
Several SBAddress properties use the lldb.target or lldb.process
convenience variables which are only set under the interactive script
interpreter. Unfortunately, users have been using these properties in
Python script and commands. This patch raises a Python exception to
force users to use GetLoadAddress instead.
Differential revision: https://reviews.llvm.org/D80848
