[FIR] Approximate integer constants in lhs of callable reference

compiler/testData/codegen/box/callableReference/bound/primitiveReceiver.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun Boolean.foo() = 1
 fun Byte.foo() = 2
 fun Short.foo() = 3

compiler/testData/diagnostics/tests/classLiteral/integerValueType.fir.kt

@@ -7,5 +7,5 @@ fun f(x: KClass<out Int>) {}
 fun test() {
     f(42::class)
     f((40 + 2)::class)
-    <!UNRESOLVED_REFERENCE!>42::toInt<!>
+    42::toInt
 }