Pseudocode: Do not generate implicit return instruction inside of

Unit-typed lambdas
 #KT-5549 Fixed

compiler/testData/diagnostics/tests/j+k/ambiguousSamAdapters.kt

@@ -13,6 +13,5 @@ public class A {
 
 fun main() {
     A.<!OVERLOAD_RESOLUTION_AMBIGUITY!>foo<!> { "Hello!" }
-    A.foo(Runnable { "Hello!" })
-}
-
+    A.foo(Runnable { <!UNUSED_EXPRESSION!>"Hello!"<!> })
+}