Add hint for some vm context function resolution errors. (#2460)
Add hint for some vm context function resolution errors. (#2460)

If you just pass a VM bytecode module with no HAL module to `iree_vm_context_create_with_modules`, now the error message is:

```
Unable to resolve VM function 'hal.ex.shared_device'. Ensure modules are registered with the context.
```
iree-org/iree,google/iree,google/iree,google/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,iree-org/iree,iree-org/iree,google/iree,google/iree,iree-org/iree,iree-org/iree