Fix resolution in macro-generated items within the same block

[Elizafox]

This is a simple one-line fix and regression test for macro-generated items within the same block.

Fixes #52389

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[chenyukang]

You can not just or orig_ident, this program:

#![feature(decl_macro)]

fn main() {
    let helper = || "outer local";
    {
        fn helper() -> &'static str {
            "inner item"
        }
        macro call_helper() {
            helper()
        }
        assert_eq!(call_helper!(), "inner item");
    }
}

compiled and will find wrong helper with this change:

thread 'main' (57310377) panicked at /tmp/now.rs:12:9:
assertion `left == right` failed
  left: "outer local"
 right: "inner item"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

View changes since the review

[chenyukang]

@rustbot author

[rustbot]

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