FieldSensitivePrunedLiveness: inject_enum_addr
only initializes the tag of enums.
#72172
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Fixes a crash when optional-chaining a move-only function that produces an address-only value; FSPL would previously see the apply that initializes the payload and the
inject_enum_tag
as overlapping defs, leading to mishandling when trying to maximize the lifetime of the enum. Fixes rdar://124207814