Add Throwable.getStackTraceAddresses() extension

To allow integration with third-party crash analytic tools.

runtime/src/main/kotlin/kotlin/Throwable.kt

@@ -34,6 +34,9 @@ public open class Throwable(open val message: String?, open val cause: Throwable
 
     public fun getStackTrace(): Array<String> = stackTraceStrings
 
+    internal fun Throwable.getStackTraceAddressesInternal(): List<Long> =
+            (0 until stackTrace.size).map { index -> stackTrace[index].toLong() }
+
     public fun printStackTrace(): Unit = dumpStackTrace { println(it) }
 
     internal fun dumpStackTrace(): String = buildString {

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

@@ -0,0 +1,8 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+package kotlin.native
+
+public fun Throwable.getStackTraceAddresses(): List<Long> =
+        this.getStackTraceAddressesInternal()

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

@@ -52,6 +52,9 @@ internal class NativePtrArray {
     @SymbolName("Kotlin_NativePtrArray_set")
     external public operator fun set(index: Int, value: NativePtr): Unit
 
+    val size: Int
+        get() = getArrayLength()
+
     @SymbolName("Kotlin_NativePtrArray_getArrayLength")
     external private fun getArrayLength(): Int
 }