(SHM-jemalloc) Removed an INFO-severity logged message that is logged from ipc::shm::arena_lend::jemalloc::Ipc_arena::get_collection_id(), a public API but more likely invoked internally from Shm_session::lend_object() which can be oft-used directly and/or for each capnp-encoded message sent through a SHM-jemalloc-backed ipc::transport::struc::Channel. / Use move-semantics in a few places internally to avoid unnecessary shared_ptr ref-count arithmetic. / Effectively remove a few redundant internal assert()s. / Comment and/or doc changes.
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… code new to me; but perf-relevant, could be significant) Removed an INFO-severity logged message that is logged from `ipc::shm::arena_lend::jemalloc::Ipc_arena::get_collection_id()`, a public API but more likely invoked internally from `Shm_session::lend_object()` which can be oft-used directly and for each capnp-encoded message sent through a SHM-jemalloc-backed `ipc::transport::struc::Channel`. / (opportunistically found while grokking code new to me; but somewhat perf-relevant) Use move-semantics in a few places internally to avoid unnecessary `shared_ptr` ref-count arithmetic. / (opportunistically found while grokking code new to me; but slightly perf-relevant if asserts-on) Effectively remove a few redundant internal `assert()`s. / Comment and/or doc changes. (Opportunistic.)>
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To code reviewer
Forgoing code review, as this is a bundling of other PRs via submodules (actually 1 PR/submodule).