Instrumentation for delayed UB stemming from uninitialized memory #7485

Job	Run time
benchcomp-tests	4m 20s
documentation	2m 7s
perf	35m 57s
regression (macos-13)	34m 13s
write-json-symtab-regression	38m 2s
regression (ubuntu-20.04)	34m 13s
regression (ubuntu-22.04)	34m 12s
regression (macos-14)	33m 57s
	3h 37m 1s

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