Disable all debug assertions unless the debug feature is enabled #40
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Several debug assertions are very expensive, causing allocation heavy code to be slowed down by over 100x in some cases.
The patch here was written by @bjorn3. I can add that I've also observed excessively slow performance in debug builds. It's my impression that the dlmalloc code is written with the assumption that its asserts won't be enabled in practice, even in typical "debug build" scenarios, because users would usually be using a precompiled malloc. But ported to Rust here, it does typically get built from source.