[K/N] Make Any.equals simpler

kotlin-native/runtime/src/main/cpp/Natives.cpp

@@ -36,11 +36,6 @@ using namespace kotlin;
 
 extern "C" {
 
-// Any.kt
-KBoolean Kotlin_Any_equals(KConstRef thiz, KConstRef other) {
-  return thiz == other;
-}
-
 KInt Kotlin_Any_hashCode(KConstRef thiz) {
   // NOTE: `Any?.identityHashCode()` is used in Blackhole implementations of both kotlinx-benchmark and
   //        K/N's own benchmarks. These usages rely on this being an intrinsic property of the object.

kotlin-native/runtime/src/main/kotlin/kotlin/Any.kt

@@ -28,8 +28,7 @@ public open class Any {
      *
      * Read more about [equality](https://kotlinlang.org/docs/reference/equality.html) in Kotlin.
      */
-    @GCUnsafeCall("Kotlin_Any_equals")
-    external public open operator fun equals(other: Any?): Boolean
+    public open operator fun equals(other: Any?): Boolean = this === other
 
     /**
      * Returns a hash code value for the object.  The general contract of `hashCode` is: