rewrite issue-109934-lto-debuginfo as an ui test

Author: Oneirical

tests/run-make/issue-109934-lto-debuginfo/Makefile

@@ -0,0 +1,22 @@
+// With the upgrade to LLVM 16, the following error appeared when using
+// link-time-optimization (LTO) alloc and debug compilation mode simultaneously:
+//
+//   error: Cannot represent a difference across sections
+//
+// The error stemmed from DI function definitions under type scopes, fixed by
+// only declaring in type scope and defining the subprogram elsewhere.
+// This test reproduces the circumstances that caused the error to appear, and checks
+// that compilation is successful.
+
+//@ check-pass
+//@ compile-flags: --test -C debuginfo=2 -C lto=fat -C incremental=inc-fat
+
+extern crate alloc;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn something_alloc() {
+        assert_eq!(Vec::<u32>::new(), Vec::<u32>::new());
+    }
+}