[Reflection] Use reference equality to determine that a callable reference is bound

It helps to avoid problems when receiver object implements structural equals violating the equality contract

#KT-60709

compiler/testData/codegen/box/reflection/callBy/kt60709.kt

@@ -0,0 +1,15 @@
+// TARGET_BACKEND: JVM
+
+// WITH_REFLECT
+
+class Eq {
+    override fun equals(other: Any?): Boolean = true
+    override fun toString(): String = "1"
+    val x: String get() = "2"
+}
+
+fun box(): String {
+    require(Eq()::toString.callBy(mapOf()) == "1")
+    require(Eq()::x.callBy(mapOf()) == "2")
+    return "OK"
+}