Cannot add aliases to InputObject parameter

For example, in the latest compute spec, the following directives result in no aliases:

``` yaml
- where:
verb: Remove
subject: VmssExtension
parameter-name: InputObject
set:
alias: VirtualMachineScaleSet

- where:
verb: Repair
subject: VmssServiceFabricUpdateDomain
parameter-name: InputObject
set:
alias: VirtualMachineScaleSet
```

Reproduce the latest compute-spec directives for the VmssExtension and VmssServiceFabricUpdateDomain subjects, focusing on the InputObject parameter and the requested VirtualMachineScaleSet alias. No source file or test is named, so first trace where these directives are processed; done means both directives produce the requested alias.

Written by the indexing model from the issue text.