Trace hooks as part of a session trace #468
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This allows to instrument packages such that a single test run can trace multiple packages and output trace counters on session exit.
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This allows to instrument packages such that a single test run can trace
multiple packages and output trace counters for all of them together on
session exit.
In my understanding, without this, the counters would reset whenever
a new instrumented package is loaded while the tests are running.
I am not sure if this is the best design, but wanted to start a discussion
on how best to profile multiple packages through a single test suite.