| 12345678 |   o Code simplification and refactoring:    - Finally remove support for malloc_good_size and malloc_usable_size.      We had hoped that these functions would let us eke a little more      memory out of our malloc implementation. Unfortunately, the only      implementations that provided these functions are also ones that      are already efficient about not overallocation: they never got us      more than 7 or so bytes per allocation. Removing them saves us      a little code complexity and a nontrivial amount of build complexity. 
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