Add regression test for issue 110929

Author: WaffleLapkin

tests/ui/generator/issue-110929-generator-conflict-error-ice.rs

@@ -0,0 +1,12 @@
+// edition:2021
+// compile-flags: -Zdrop-tracking-mir=yes
+// failure-status: 101
+#![feature(generators)]
+
+fn main() {
+    let x = &mut ();
+    || {
+        let _c = || yield *&mut *x;
+        || _ = &mut *x;
+    };
+}