FIR: rewrite lambda return type inference

* `return` should only be added to the last statement if the return
   type is not Unit

 * If there is a `return` without an argument, then the expected return
   type is Unit and the last expression is not a return argument (unless
   it's an incomplete call, in which case it is inferred to return Unit;
   this behavior is questionable, but inherited from K1)

 * There should be a constraint on return arguments even if the expected
   type is Unit, otherwise errors will be missed

 * When the expected type is known, using the call completion results
   writer is pointless (and probably subtly wrong).

^KT-54742 Fixed

.idea/artifacts/kotlin_dom_api_compat_1_8_255_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="kotlin-dom-api-compat-1.8.255-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/libraries/kotlin-dom-api-compat/build/libs</output-path>
+    <root id="archive" name="kotlin-dom-api-compat-1.8.255-SNAPSHOT.jar">
+      <element id="module-output" name="kotlin.kotlin-dom-api-compat.main" />
+    </root>
+  </artifact>
+</component>