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

compiler/testData/diagnostics/tests/controlStructures/kt786.fir.kt

@@ -0,0 +1,26 @@
+package kt786
+
+//KT-786 Exception on incomplete code with 'when'
+fun foo() : Int {
+    val d = 2
+    var z = 0
+    when(d) {
+        5, 3 -> z++
+        else -> { z = -1000 }
+        return z -> 34
+    }
+}
+
+//test unreachable code
+fun fff(): Int {
+    var d = 3
+    when(d) {
+        4 -> 21
+        return 2 -> return 47
+        bar() -> 45
+        444 -> true
+    }
+    return 34
+}
+
+fun bar(): Int = 8