Instrumentation for delayed UB stemming from uninitialized memory #7484

Job	Run time
benchcomp-tests	3m 37s
documentation	2m 3s
perf	33m 30s
regression (macos-13)	1m 49s
write-json-symtab-regression	1h 30m 54s
regression (ubuntu-20.04)	1m 32s
regression (ubuntu-22.04)	1m 49s
regression (macos-14)	1m 39s
	2h 16m 53s

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