Show line markers for suspending iteration

#KT-16803 Fixed

idea/testData/codeInsight/lineMarker/suspendCall/suspendIteration.kt

@@ -0,0 +1,17 @@
+fun coroutine(block: suspend () -> Unit) {}
+
+class SIter {
+    operator fun iterator() = this
+    suspend operator fun hasNext(): Boolean = false
+    suspend operator fun next(): Int = 0
+    suspend fun test() {}
+}
+
+fun foo() {
+    val iter = SIter()
+    coroutine {
+        iter.<lineMarker descr="Suspend function call">test</lineMarker>() // this line is marked (LINE1)
+        for (x in <lineMarker descr="Suspending iteration">iter</lineMarker>) // this line is not (LINE2)
+            println(x)
+    }
+}