Regression test for bug related to interaction between instrumentation
installation and class redefinition.

Redefining a class does not update the instrumentation stack of a thread.
This is generally fine because the method pointer in the instrumentation
stack is only used for some soundness checks, logging and method-exit events
(where it being the non-obsolete version is advantageous). Unfortunately some
of the checks fail to account for obsolete methods and can fail soundness
checks.