InferAddressSpaces: Handle ptrmask intrinsic
This one is slightly odd since it counts as an address expression, which previously could never fail. Allow the existing TTI hook to return the value to use, and re-use it for handling how to handle ptrmask. Handles the no-op addrspacecasts for AMDGPU. We could probably do something better based on analysis of the mask value based on the address space, but leave that for now.