Revert unaligned tests.

They lead to two problems:
1. The change to set TESTNUM before the test instead of after broke a
   few tests that relied on the old behavior.
2. Some tests in the v variant do something in the exception handler
   such that when they get an unaligned access exception, they end up
   stuck in a loop of unaligned access exceptions and the exception
   handler set up in the test is never called.