Emit `dead` goto-instructions on MIR StatementDead #6263

Job	Run time
benchcomp-tests	4m 11s
bookrunner	13m 24s
perf	28m 2s
regression (macos-13)	34m 27s
write-json-symtab-regression	12m 29s
regression (ubuntu-20.04)	22m 42s
regression (ubuntu-22.04)	23m 20s
	2h 18m 35s

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