Comment explaining StorageLive/StorageDead modelling #360

Job	Run time
benchcomp-tests	3m 59s
regression (macos-13)	41m 20s
write-json-symtab-regression	14m 44s
regression (ubuntu-20.04)	21m 34s
regression (ubuntu-22.04)	23m 5s
perf	6h 0m 16s
documentation	1m 59s
regression (macos-14)	19m 26s
	8h 6m 23s

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