Instrumentation for delayed UB stemming from uninitialized memory #7498

Job	Run time
perf	34m 8s
benchcomp-tests	3m 47s
documentation	3m 38s
regression (macos-13)	9m 57s
regression (ubuntu-20.04)	9m 56s
write-json-symtab-regression	8m 59s
regression (ubuntu-22.04)	9m 36s
regression (macos-14)	10m 0s
	1h 30m 1s

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