JVM IR: Avoid direct invokes in callable reference tests

Due to the direct invoke optimization, most callable reference tests
were not generating callable references/lambdas.

compiler/testData/codegen/box/functions/localFunctions/kt2895.kt

@@ -3,7 +3,7 @@ fun outer() {
         if (i > 0){
             {
                 it: Int -> inner(0) // <- invocation of literal itself is generated instead
-            }.invoke(1)
+            }.let { it.invoke(1) }
         }
     }
     inner(1)

compiler/testData/codegen/box/functions/localFunctions/overloadedLocalFunction3.kt

@@ -14,7 +14,7 @@ fun box(): String {
         {
             foo(foo, 1)
             foo("K")
-        } ()
+        }.let { it() }
     }
 
     return s