Christian Helmuth d452094f43 Only rewind next-free pointer in Bit_allocator
Formerly, _next was always updated to the last free'd allocation, which
left large gaps on alloc/free bursts. Now, we try keep allocation
density high from the start of the array and ensure that allocations
happen at the lowest available index in the bit array.

Fixes #3679
2020-03-26 11:38:53 +01:00
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