compiletest: Self-test for normalize-* with revisions

Author: Zalathar

tests/ui/compiletest-self-test/normalize-with-revision.a.run.stderr

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+1st emitted line
+second emitted line

tests/ui/compiletest-self-test/normalize-with-revision.b.run.stderr

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+first emitted line
+2nd emitted line

tests/ui/compiletest-self-test/normalize-with-revision.rs

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+//! Checks that `[rev] normalize-*` directives affect the specified revision,
+//! and don't affect other revisions.
+//!
+//! This currently relies on the fact that `normalize-*` directives are
+//! applied to run output, not just compiler output. If that ever changes,
+//! this test might need to be adjusted.
+
+//@ edition: 2021
+//@ revisions: a b
+//@ run-pass
+//@ check-run-results
+
+//@ normalize-stderr: "output" -> "emitted"
+//@[a] normalize-stderr: "first" -> "1st"
+//@[b] normalize-stderr: "second" -> "2nd"
+
+fn main() {
+    eprintln!("first output line");
+    eprintln!("second output line");
+}