Andrew Trick 97ec127d25 Lower and emit debug_value [poison]. ...

OwnershipEliminator lowers destroy_value [poison] to debug_value
[poison].

IRGen overwrites all references in shadow copies with a sentinel value
in place of debug_value [poison].

Part 2/2: rdar://75012368 (-Onone compiler support for early object
deinitialization with sentinel dead references)

2021-03-12 19:33:23 -08:00

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