C++17 std::pmr::memory_resource for host_memory_resource

[nirandaperera]

Description

rmm::mr::host_memory_resource mentions that when rmm uses C++17, it should extend std::pmr::memory_resource interface. This PR adds it, since rmm is on C++17 now.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[copy-pr-bot]

Auto-sync is disabled for draft pull requests in this repository. Workflows must be run manually.

Contributors can view more details about this message here.

[harrism]

But should we? Now that cuda::memory_resource exists, the strategy may be different. CC @miscco @jrhemstad . @nirandaperera I think this should be discussed in an issue.

[nirandaperera]

@harrism I see. I was thinking of using the pinned_memory_resource with the std synchronized pool.

[nirandaperera]

@harrism I opened up an issue here #1961