Stepping: do not step into kotlin standard library

#KT-2076 Fixed

idea/testData/debugger/tinyApp/src/filters/stdlibStep.kt

@@ -0,0 +1,8 @@
+package stdlibStep
+
+fun main(args: Array<String>) {
+    val a = intArray(1)
+    //Breakpoint!
+    a.withIndices()
+    val b = 1
+}