David Goldblatt a9fa2defdb Add JEMALLOC_COLD, and mark some functions cold.
This hints to the compiler that it should care more about space than CPU (among
other things).  In cases where the compiler lacks profile-guided information,
this can be a substantial space savings.

For now, we mark the mallctl or atexit driven profiling and stats functions that
take up the most space.
2021-01-04 14:55:49 -08:00
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