Instrumentation for delayed UB stemming from uninitialized memory #7585

Job	Run time
benchcomp-tests	4m 46s
perf	36m 36s
documentation	2m 0s
regression (macos-13)	41m 52s
write-json-symtab-regression	15m 30s
regression (ubuntu-20.04)	23m 5s
regression (ubuntu-22.04)	23m 37s
regression (macos-14)	18m 8s
	2h 45m 34s

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