Function mangled_symbol 

pub fn mangled_symbol(base: &str, crate_hash: &str) -> String

Append the per-crate hash to a wasm shim symbol so that identically named exports from different crates (or different versions of one crate) cannot collide at link time. The macro emits every export shim under this mangled name; cli-support recomputes it from the hash carried in Program::unique_crate_identifier and renames the export back to its canonical name once matched.