Unwrap `InOutExpr` from all parens until the outermost paren or a tuple
to correctly diagnose calls like `foo(((&bar)))` or `foo(x: (&bar))`,
and suggest a fix-it with moves `&` outside parens.
Resolves: rdar://problem/71356981
Two fixes here:
- The ASTScopeDeclConsumerForLocalLookup needs to visit auxiliary variables
- preCheckExpression() should call ASTScope::lookupLocalDecls() even when
parser lookup is enabled, since otherwise we won't be able to find
auxiliary decls in the current DeclContext.
Before performing an UnqualifiedLookup with Flags::IncludeOuterResults
turned on, call ASTScope::lookupSingleLocalDecl() to find local
bindings that precede the current source location.
If this fails, we perform an unqualified lookup to try to find
forward references to captures, type members, and top-level
declarations.
