Rollup merge of #142674 - hkBst:remove-duplicate-crashtest, r=bjorn3

remove duplicate crash test

I noticed near duplication between "library/alloctests/tests/testing/crash_test.rs" and "library/alloctests/testing/crash_test.rs" and wanted to try and remove that. The only difference is the path used to import `Debug`, but it seems not to matter. Perhaps my change is still wrong?

r? ``@bjorn3``

Author: Kobzol