Auto merge of #28286 - matklad:remove-dead-code, r=eddyb
Auto merge of #28286 - matklad:remove-dead-code, r=eddyb

There is a dead code in libsyntax/parser/parse.rs, when parsing structs.

Two functions are involved:

* [parse_item_struct](https://github.com/rust-lang/rust/blob/cd9c9f048f6aa0be091cd9835771ba0712bead4e/src/libsyntax/parse/parser.rs#L4691)
* [parse_tuple_struct_body](https://github.com/rust-lang/rust/blob/cd9c9f048f6aa0be091cd9835771ba0712bead4e/src/libsyntax/parse/parser.rs#L4769)

The problem is that both functions handle the case with unit structs. But because
`parse_tuple_struct_body` is called from `parse_item_struct`, it never faces
this case.

This PR removes unit struct case from `parse_tuple_struct_body` function. I tested with `make -j8 check-statge1`.

aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust