ARROW-5605, ARROW-5921: add arrow-ipc crashes

* add arrow-ipc crash 74aec871d14bb6b07c72ea8f0e8c9f72cbe6b73c

Issue: ARROW-5605

* Add a crash involving wrong aligned data.

This was an issue in arrow 0.13 but is fixed in 0.14. Add this as a
regression test to the corpus.

* Add nullptr related IPC crashes found in ARROW-5921
7 files changed
tree: 4275ff5b10af7f7957631aec90edb6f4e6cba4ae
  1. data/
  2. README.md
README.md