Add inlining hints to concurrent hash map #2394
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Improves performance of begin/find for clang
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This PR adds inlining hints to several functions of the ConcurrentHashMap. With clang17 and NVIDIA Grace, this speeds up the benchmarks for begin() by ~35-40% and find() by ~15-20%. The iterate benchmarks show inconclusive results and may have a slowdown or speedup depending on input size and number of threads. Overall the effect is positive.
This PR depends on #2393, otherwise the additional inlining hints will allow the compiler to remove parts of the benchmark.