+641% compilation performance regression on small files

Updating to latest, I find there is a large performance regression that has occurred, that is especially notable on small files.

Previously compiling small html file outputs like hello world used to feel "instantaneous". Now, when I run emcc, it takes well more than two seconds. Looking at a profile, there are some new steps that I don't recall from before:


namely strip_producers, check_node, check_sanity all seem superfluous. This whole producers tracking is silly, could we not have Binaryen generate any fingerprintable toolchain producer info in the first place instead of running a postprocessing tool to remove the info?

Also, installations sourced via Emsdk should not need to run any sanity checks, and I could swear we had sanity checks disabled for Emsdk users already at some point?

Those would remove 61ms+205ms+29ms = 295ms, though that is still quite far short from getting "instantaneous" compilation performance on hello world? Are there other items that would be known to slow down compilation performance recently?