Instrumentation for delayed UB stemming from uninitialized memory #7716

Job	Run time
benchcomp-tests	4m 20s
documentation	2m 7s
perf	26m 10s
regression (macos-13)	40m 10s
write-json-symtab-regression	16m 50s
regression (ubuntu-20.04)	27m 34s
regression (ubuntu-22.04)	28m 11s
regression (macos-14)	31m 36s
	2h 56m 58s

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