Implement a faster stable sort algorithm#90545

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wpwoodjr wants to merge 3 commits intorust-lang:masterfrom

wpwoodjr:master

Commits on May 14, 2022

update slice.rs to use merge sort for improved sort performance
wpwoodjr
committed
improve safety of merge sort per PR comments
wpwoodjr
committed
clarify safety of swap_slices, remove debug_asserts to see if performance improves on regression test
wpwoodjr
committed