Generate last expression in coroutine block even for Unit expected type

compiler/testData/codegen/box/coroutines/lastUnitExpression.kt

@@ -0,0 +1,26 @@
+class Controller {
+    var ok = false
+    var v  = "fail"
+    suspend fun suspendHere(v: String, x: Continuation<Unit>) {
+        this.v = v
+        x.resume(Unit)
+    }
+
+    operator fun handleResult(u: Unit, v: Continuation<Nothing>) {
+        ok = true
+    }
+}
+
+fun builder(coroutine c: Controller.() -> Continuation<Unit>): String {
+    val controller = Controller()
+    c(controller).resume(Unit)
+    if (!controller.ok) throw java.lang.RuntimeException("Fail 1")
+    return controller.v
+}
+
+fun box(): String {
+
+    return builder {
+        suspendHere("OK")
+    }
+}