Provide publicly visible identity hash code. (#3690)

* Provide publicly visible identity hash code.

* Review feedback.

extracted/konan.serializer/src/org/jetbrains/kotlin/resolve/konan/platform/NativePlatformAnalyzerServices.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.resolve.konan.platform
 
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.resolve.ImportPath
 import org.jetbrains.kotlin.resolve.PlatformConfigurator
 import org.jetbrains.kotlin.resolve.PlatformDependentAnalyzerServices
@@ -16,4 +17,9 @@ object NativePlatformAnalyzerServices : PlatformDependentAnalyzerServices() {
     }
 
     override val platformConfigurator: PlatformConfigurator = KonanPlatformConfigurator
+
+    override val excludedImports: List<FqName> =
+            listOf("identityHashCode").map {
+                FqName("kotlin.native.$it")
+            }
 }

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

@@ -5,6 +5,7 @@
 
 package kotlin
 
+import kotlin.native.identityHashCode
 import kotlin.native.internal.ExportTypeInfo
 
 /**
@@ -47,7 +48,3 @@ public open class Any {
         return "$className@$hashCodeStr"
     }
 }
-
-@PublishedApi
-@SymbolName("Kotlin_Any_hashCode")
-external internal fun Any.identityHashCode(): Int

runtime/src/main/kotlin/kotlin/native/Runtime.kt

@@ -51,4 +51,11 @@ public fun setUnhandledExceptionHook(hook: ReportUnhandledExceptionHook): Report
 }
 
 @SymbolName("Kotlin_setUnhandledExceptionHook")
-external private fun setUnhandledExceptionHook0(hook: ReportUnhandledExceptionHook): ReportUnhandledExceptionHook?
+external private fun setUnhandledExceptionHook0(hook: ReportUnhandledExceptionHook): ReportUnhandledExceptionHook?
+
+/**
+ * Compute stable wrt potential object relocations by the memory manager identity hash code.
+ * @return 0 for `null` object, identity hash code otherwise.
+ */
+@SymbolName("Kotlin_Any_hashCode")
+public external fun Any?.identityHashCode(): Int

runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt

@@ -6,6 +6,7 @@
 package kotlin.native.concurrent
 
 import kotlin.native.internal.ExportForCppRuntime
+import kotlin.native.identityHashCode
 import kotlin.reflect.KClass
 import kotlinx.cinterop.*
 

runtime/src/main/kotlin/kotlin/native/internal/RuntimeUtils.kt

@@ -205,4 +205,4 @@ internal fun <T> listOfInternal(vararg elements: T): List<T> {
 
 @PublishedApi
 @SymbolName("OnUnhandledException")
-external internal fun OnUnhandledException(throwable: Throwable)
+external internal fun OnUnhandledException(throwable: Throwable)