LIS new capacity policy #6
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Adjust the size policy of LIS lists (implemented using std::vector<>): the new policy is that it will have at least half empty reserved capacity after a clean operation.
It aims to avoid a scenario where a list grows to size X, cleaned to size X/2, and then re-grows to X, while requesting a memory allocation.
It will result in slightly less efficient memory utilization. But in one test, both clang and gcc report a ~4% performance improvement.