Nate Chandler 4f0d1dab5e [CopyPropagation] Canonicalize copies of lexical. ...

Currently, CopyPropagation only canonicalizes defs that are "canonical",
that is, the root of the copy_value tree.  When that canonical
def is lexical, however, the canonicalization respects deinit barriers.
But copies of lexical values are not themselves lexical, so their
lifetimes can be shortened without respect to deinit barriers.

Here, immediate copies of lexical values are canonicalized before the
lexical values themselves are.

rdar://107197935

2023-03-27 07:08:01 -07:00

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