Support equals/hashCode for fun interfaces in JVM and JVM_IR

#KT-33455 Fixed

compiler/testData/codegen/box/funInterface/equality/localFunctionReferences.kt

@@ -0,0 +1,36 @@
+// IGNORE_BACKEND: JS, JS_IR, NATIVE
+// IGNORE_BACKEND_FIR: JVM_IR
+
+fun checkEqual(x: Any, y: Any) {
+    if (x != y || y != x) throw AssertionError("$x and $y should be equal")
+    if (x.hashCode() != y.hashCode()) throw AssertionError("$x and $y should have the same hash code")
+}
+
+fun checkNotEqual(x: Any, y: Any) {
+    if (x == y || y == x) throw AssertionError("$x and $y should NOT be equal")
+}
+
+fun interface FunInterface {
+    fun invoke()
+}
+
+private fun id(f: FunInterface): Any = f
+
+fun box(): String {
+    fun local1() {}
+    fun local2() {}
+
+    checkEqual(id(::local1), id(::local1))
+    checkNotEqual(id(::local1), id(::local2))
+
+    fun String.localExt() {}
+
+    checkEqual(id("A"::localExt), id("A"::localExt))
+    checkNotEqual(id("A"::localExt), id("B"::localExt))
+
+    fun adapted(default: String? = "", vararg va: Int): Int = 0
+
+    checkEqual(id(::adapted), id(::adapted))
+
+    return "OK"
+}