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ebc0395cee
- add a benchmark for various metadata creation styles - add factory functions for status + message - these are 3-10x faster than going via absl::Status - add a `MakePooledForOverwrite` function to Arena, use it everywhere -- this naming matches `std::make_unique_for_overwrite` in C++20, and avoids some language mandated initialization in `Table` (underlying `MetadataMap<>`) - speeding creation of metadata handles by 30% For `bm_call_spine` we see before: ``` BM_UnaryWithSpawnPerEnd<CallSpineFixture>_median 745 ns 745 ns ``` and after: ``` BM_UnaryWithSpawnPerEnd<CallSpineFixture>_median 699 ns 699 ns ``` Closes #37111 COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37111 from ctiller:meta-magic-2 100464fc7e2c12f881f3d5a10ad6d7335d4f582c PiperOrigin-RevId: 652900726