Fix lack of robustness in stacktrace scrubbing #49633
Merged
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Fixes #49451 (comment).
From what I understand, we can't reliably assume that macro expansions will be present in the stacktrace, and the solutions to make such assumptions valid require some nontrivial effort in lowering. So for now, we'll play along and accept that the stacktrace will be longer if we don't have the required information to scrub it.
I didn't include the change proposed in #44757, as I don't know exactly when/if such top-level frames for Test.jl are really expected to be present.