Adds a reference from a cnode its cptr
Rationale: When the `revoke` handler is called for a particular cspace, cnode, and object, the cptr associated with that cnode needs to be free'd so it can be re-used by other objects (given there are a relatively small number of cptrs in a cspace). We can discover the cptr_cache associated with a cspace by looking at the `cspace->owner` field (which we point at our cache), but we can't figure out from the cnode alone which pointer in that cache points to the given cnode. This information is known when the cnode is created, so I added a field to the cnode that contains this information.
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