[FIR-TEST] Add new testdata generated after changes in previous commit

compiler/testData/diagnostics/tests/inference/kt28654.fir.kt

@@ -0,0 +1,10 @@
+// !WITH_NEW_INFERENCE
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// Related issue: KT-28654
+
+fun <K> select(): K = run { }
+
+fun test() {
+    val x: Int = select()
+    val t = select()
+}