Port mimalloc to version 3 #218

Job	Run time
🚧 Build SPAdes	1m 35s
Mate-pairs B.faecium	2m 29s
Full run M.ruber JGI lane 9	5m 8s
Multicell B.cereus TruSeq 100x	4m 16s
IonTorrent E.coli K12	2m 3s
Contigs E.coli JGI lane 7	3m 52s
Nextera L.monocytogenes	1m 9s
Saves E.coli UCSD lane 1	10m 28s
metaSPAdes JGI 150	15m 3s
plasmidSPAdes C.callunae	7m 0s
Single reads E.coli Deeptrench	3m 36s
Single-cell P.heparinus JGI lane 7	2m 44s
PacBio M.ruber	3m 51s
metaviralSPAdes ERR525599	13m 45s
Saves E.coli 100K	51s
	1h 17m 50s

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