proxy lib with shm + IPC scenario doesn't work

Please provide a reproduction of the bug:

Currently, 2 process scenario where the first process (client) uses UMF through Proxy Lib with UMF_PROXY="page.disposition=shared-shm" and sends IPC handles to the server, and second process (server) got data from the client and opens IPC handle doesn't work.
This is because the server needs to know the name of the shm, as it is needed as an argument to the OS provider create.

How often bug is revealed:

always

Actual behavior:

Server process call to OpenIPCHandle() returns error.

Additional information about Priority and Help Requested:

Are you willing to submit a pull request with a proposed change? Yes

Requested priority: High