Merge "Make lldb default for gdbclient.py" am: e8ab4475ea am: 4cb07a4dd3 am: cb0d905d85 am: 59c419dff4 am: af3765a536

Original change: https://android-review.googlesource.com/c/platform/development/+/1427156

Change-Id: Ibd70866e60f9031bf652a6a8aad276a29d13da57