Instrumentation for delayed UB stemming from uninitialized memory #7535

Job	Run time
regression (macos-13)	28m 13s
regression (ubuntu-20.04)	22m 49s
regression (ubuntu-22.04)	24m 35s
regression (macos-14)	18m 42s
write-json-symtab-regression	15m 7s
benchcomp-tests	5m 1s
documentation	2m 4s
perf	34m 53s
	2h 31m 24s

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