Instrumentation for delayed UB stemming from uninitialized memory #7623

Job	Run time
benchcomp-tests	3m 56s
documentation	2m 26s
perf	25m 49s
regression (macos-13)	37m 54s
write-json-symtab-regression	16m 3s
regression (ubuntu-20.04)	27m 31s
regression (ubuntu-22.04)	28m 43s
regression (macos-14)	29m 18s
	2h 51m 40s

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