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This adds two new imports to fuzzer modules:
* call-export, which gets an export index and calls it.
* call-export-catch, which does the call in a try-catch, swallowing
any error, and returning 1 if it saw an error.
The former gives us calls back into the wasm, possibly making various
trips between wasm and JS in interesting ways. The latter adds a
try-catch which helps fuzz wasm EH.
We do these calls using a wasm export index, i.e., the index in
the list of exports. This is simple, but it does have the downside that
it makes executing the wasm sensitive to changes in exports (e.g.
wasm-merge adds more), which requires some handling in the fuzzer.
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Continues the work from #7027 which added throwing from JS, this adds
table get/set operations from JS, to further increase our coverage of
Wasm/JS interactions (the table can be used from both sides).
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We already generated (throw ..) instructions in wasm, but it makes sense to model
throws from outside as well, as they cross the module boundary. This adds a new fuzzer
import to the generated modules, "throw", that just does a throw from JS etc.
Also be more precise about handling fuzzing-support imports in fuzz-exec: we now
check that logging functions start with "log*" and error otherwise (this check is
now needed given we have "throw", which is not logging). Also fix a minor issue
with name conflicts for logging functions by using getValidFunctionName for them,
both for logging and for throw.
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