Some progress: running one of the failing tests through nodejs with the
--no-opt flag (for no optimizations) makes it consistently pass.

It looks like V8 is optimizing too aggressively, and incorrectly.

I can observe that when values start diverging, ft() is being called
with s===2, and despite that the "other" code path is run (return b ^ c
^ d).

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  autopkgtest failures on ppc64el with nodejs 12.18.2

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