Hello all,

As of 5d2cadb, the default allocator used in the runtime on all
platforms is now jemalloc. This provides significant allocation
speedup on Windows and Mac, and good speedup on Linux. Additionally,
memory usage should be lower and (untested) less fragmented. There are
some numbers on issue #6897.

This shouldn't break or otherwise negatively affect existing code (if
it does, open an issue, as usual).
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