wasm2c: prettify/change name mangling (#2142)

* wasm2c: prettify/change name-mangling

This refactors the wasm2c name-mangling in two big ways:

1) Removing the `Z_` prefix and trying to make the names somewhat
   ergonomic/pretty. Previously the `factorial` export from a `fac`
   module looked like this:

   ```
   u32 Z_facZ_factorial(Z_fac_instance_t*, u32);
   ```

   After this commit, it looks like this:

   ```
   u32 w2c_fac_factorial(w2c_fac*, u32);
   ```

   Symbols defined by wasm2c itself (including instantiate, free,
   get_func_type and the imported memory limits) are now prefixed with
   `wasm2c_` to avoid conflicting with names defined by the module.

2) Using globally unique (module-prefixed) names for functions, types,
   segments, and tags, even though they are currently static
   (internal-linkage) symbols in the .c output. This is preparation for
   a future "multiple .c output" option where these symbols will need to
   have external linkage.

0 files changed, 0 insertions, 0 deletions