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We previously supported a non-standard `(func "name" ...` syntax for declaring
functions exported with the quoted name. Since that is not part of the standard
text format, drop support for it, replacing it with the standard `(func $name
(export "name") ...` syntax instead.
Also replace our other usage of the quoted form in our text output, which was
where we quoted names containing characters that are not allowed to appear in
standard names. To handle that case, adjust our output from `"$name"` to
`$"name"`, which is the standards-track way of supporting such names. Also fix
how we detect non-standard name characters to match the spec.
Update the lit test output generation script to account for these changes,
including by making the `$` prefix on names mandatory. This causes the script to
stop interpreting declarative element segments with the `(elem declare ...`
syntax as being named "declare", so prevent our generated output from regressing
by counting "declare" as a name in the script.
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i64 reinterprets were lowered in the i64 pass, and i32s at the very end, in
wasm2js itself. This could break since in between the i64 pass and wasm2js
we run optimizations, and the optimizer was not aware of what we lower
the i32 reinterprets to - calls to use scratch memory. Those calls have a
side effect of altering scratch memory. The optimizer just saw an i32
reinterpret, and moved it across the i64 reinterpret's scratch memory calls.
This makes 32-bit reinterprets use separate scratch memory from 64-bit ones,
which means they can never interfere with each other.
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