Sema seems to be flagging inout expressions (e.g. &foo) in expression
macros as invalid, setting up a catch 22 where Sema emits an error when
a parameter has the '&' sigil and type checking fails when it doesn't.
This resolves the issue by allowing inout expressions inside macro
expansion expressions.
Resolves https://github.com/swiftlang/swift/issues/82369.
85208293c9