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Automated renaming according to
https://github.com/WebAssembly/spec/issues/884#issuecomment-426433329.
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* Error if there are more locals than browsers allow (50,000). We usually just warn about stuff like this, but we do need some limit (or else we hang or OOM), and if so, why not use the agreed-upon Web limit.
* Do not generate nice string names for locals in binary parsing - the name is just $var$x instead of $x, so not much benefit, and worse as our names are interned this is actually slow (which is why the fuzz testcase here hangs instead of OOMing).
Testcases and bugreport in #1663.
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We can remove the memory/table (itself, or an import if imported) if they are not used. This is pretty minor on a large wasm file, but when reading small wasts it's very noticeable to have an unused memory and table all the time.
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* don't emit a toplevel block if we don't need to, as in wasm it is a list context
* don't create unnecessary blocks in wasm reading
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These are not atomic operations, but are added with the atomic operations to keep from having to define atomic versions of all the sign-extending loads (an atomic zero-extending load + signext operation can be used instead).
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