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/callableReference/function/local/extensionToLocalClass.kt

@@ -1,5 +1,5 @@
 fun box(): String {
     class A
     fun A.foo() = "OK"
-    return (A::foo)((::A)())
+    return (A::foo).let { c -> c((::A).let { it() }) }
 }