Michael Gottesman a589b4a128 [moveOnly] Add an @_noImplicitCopy decl attribute and allow it to be only attached to local lets. ...

Some notes:

1. This is not actually wired up to any part of codegen. Instead, this PR just
has the code necessary to parse the attribute and to ensure that we use it only
on local lets. The rest will come in subsequent commits.

2. I am allowing for the attribute to be attached to generic things in Sema
since we do not have enough information in the TypeChecker to distinguish in
between structs with a type parameter but that have all non-generic stored vars
from one with generic stored vars. We can only support the later with opaque
values but the former we can support without opaque values (and is one of the
use cases we are interested in).

rdar://83957088

2021-10-26 13:00:54 -07:00

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