update domvm

[leeoniya]

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[leeoniya]

@mathieuancelin

thanks! i got another update on the way, actually. I didn't realize until now that mutations in this bench happen at the db level (rows) rather than cell level (tds). A simple optimization of oldDb === newDb yeilds 100% perf boost at 1% mutations, maybe 7% improvement at 50% and -5% regression at 100% (still investigating).

the resulting code is nearly identical by splitting off the row/db tpl into a sub-view and comparing the dbs (not at all esoteric). would this be considered an "optimized version" or should i just replace the main impl and maybe leave the old code in a large comment?