offset-converter and caller-provided instantiateWasm hooks

[pfaffe]

Enabling USE_OFFSET_CONVERTER (directly or by enabling sanitizers) breaks caller provided instantiateWasm hooks.

This option adds a run dependency that is resolved in instantiateSync, instantiateAsync, or instantiateArrayBuffer. When the caller provides a custom instantiateWasm hook, however, neither of those functions is called, the dependency is never resolved, and the module never finishes loading. In particular that means that sanitizers and a custom instantiation hook cannot be used together.