Moved NativePtr from interop to konan.internal

runtime/src/main/kotlin/konan/internal/Coroutines.kt

@@ -89,8 +89,7 @@ abstract internal class CoroutineImpl(
 
     // label == -1 when coroutine cannot be started (it is just a factory object) or has already finished execution
     // label == 0 in initial part of the coroutine
-    // TODO: use IntPtr.
-    protected var label: Long = if (completion != null) 0L else -1L
+    protected var label: NativePtr = if (completion != null) NativePtr.NULL else NativePtr.NULL + (-1L)
 
     private val _context: CoroutineContext? = completion?.context
 

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

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package konan.internal
+
+@Intrinsic external fun getNativeNullPtr(): NativePtr
+
+class NativePtr private constructor() {
+    companion object {
+        val NULL = getNativeNullPtr()
+    }
+
+    @Intrinsic external operator fun plus(offset: Long): NativePtr
+
+    @Intrinsic external fun toLong(): Long
+
+    override fun equals(other: Any?) = (other is NativePtr) && konan.internal.areEqualByValue(this, other)
+
+    override fun hashCode() = this.toLong().hashCode()
+
+    override fun toString() = "0x${this.toLong().toString(16)}"
+}