Zero alloc: bounded join of witnesses#2489
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On top of #2487. Last two commits are new.
Heuristics to limit the number of witnesses tracked by the analysis. This PR does not change precision of the analysis.
The first commit is the same as the first commit of #1472: keep at most
nwitnesses wherenis based on-checkmach-details-cutoff nflag with default 20.The second commit limits the number of elements of a symbolic representation of
Jointhat containsTop. It can result in more or less witnesses depending on how the variables are resolved, but it is a reasonable limit based onnabove and easy to compute.Note that witnesses are not tracked by default for functions that are not annotated with
[@zero_alloc ..]assertions (unless-checkmach-details-cutoffis set to track all witnesses, which is used for displaying allocations in an editor). The motivation of this PR is to ensure that adding an "assert" on a function does not increase compilation overhead unnecessarily.