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This fixes a regression where projects that use the C++ stdlib overlay stop building because of a linker error: ``` ld: Shared cache eligible dylib cannot link to ineligible dylib '@rpath/libswiftCompatibilitySpan.dylib'. ``` Usages of `Span<T>` would generally cause a type metadata accessor to be emitted for `Swift.Span`. This becomes a problem with backdeployment, since Span is partially defined in a compatibility binary. This change adds `@_alwaysEmitIntoClient` to generic usages of `Span` to prevent the type metadata accessor from being emitted into `libswiftCxx.a`. rdar://152192080