Change functions to have one return value #206
Merged
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This commit changes wit-defined functions to have precisely one return
value instead of a list of return values. This matches the upstream
component-model draft specification and canonical ABI. The main fallout
here is that the spidermonkey tests stopped testing multiple-returns
since while multi-value was implemented struct lifting/lowering is not
yet implemented. Otherwise this is relatively straightforward although
there are a few gotchas here and there as some language like JS, Python,
and C don't have native tuple types and we still want to generate
reasonable-ish code.