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A constant is either fixed up immediately, or does not need a call. This makes us
slightly faster in the fuzzer, but does not change behavior as before those calls all
ended up doing nothing (as the numbers were not nans).
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All logging/instrumentation passes need to do this, to avoid us using stale
global effects that are too low (too high is not optimal either, but at least it
cannot cause bugs).
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When using nominal types, func.ref of two functions with identical signatures
but different HeapTypes will yield different types. To preserve these semantics,
Functions need to track their HeapTypes, not just their Signatures.
This PR replaces the Signature field in Function with a HeapType field and adds
new utility methods to make it almost as simple to update and query the function
HeapType as it was to update and query the Function Signature.
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Instead of instrumenting every local.get, instrument parameters
on arrival at a function once on entry. After that, every local will
always contain a de-naned value (since we would denan on a
local.set). This is more efficient and also less confusing I think.
Also avoid doing anything to values that fall through as they
have already been fixed up.
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This moves the fuzzer de-NaN logic out into a separate pass. This is
cleaner and also better since the old way would de-NaN once, but then
the reducer could generate code with nans. The new way lets us de-NaN
while reducing.
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