Andrew and I have discovered that on Linux max peak rss value
is taken to be `max(build_runner, test_suite)` and since the thunks
test emit a huge binary, we will easily exceed the declared maximum
for any of the test suites. This can be worked around for now by not
checking for $thunk symbols in this test since it doesn't really
yield any additional information; however ideally we would implement
per-thread local temp arena that can be freed.