Deprecated enum values using deprecated expressions shouldn't be warned about

[dlangBugzillaToGithub]

Jan Jurzitza reported this on 2019-05-11T21:05:58Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=19865

Description

enum Foo {
    a,
    deprecated b,
}

enum Bar {
	deprecated c = Foo.b
}


is generating the following deprecation notice:

a.d(7): Deprecation: enum member `a.Foo.b` is deprecated

Using deprecated values inside a deprecated field should not generate that notice.