Instrumentation for delayed UB stemming from uninitialized memory #7558

Job	Run time
benchcomp-tests	3m 42s
documentation	2m 2s
perf	33m 42s
regression (macos-13)	31m 38s
write-json-symtab-regression	14m 17s
regression (ubuntu-20.04)	26m 1s
regression (ubuntu-22.04)	23m 3s
regression (macos-14)	17m 40s
	2h 32m 5s

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