Instrumentation for delayed UB stemming from uninitialized memory #7457

Job	Run time
documentation	2m 4s
benchcomp-tests	5m 47s
perf	29m 44s
regression (macos-13)	33m 26s
write-json-symtab-regression	17m 14s
regression (ubuntu-20.04)	25m 44s
regression (ubuntu-22.04)	26m 27s
regression (macos-14)	21m 45s
	2h 42m 11s

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