stdlib: Add clear and remove methods in AbstractMutableCollection

backend.native/tests/build.gradle

@@ -790,9 +790,9 @@ task lateinit_notInitialized(type: RunKonanTest) {
     source = "codegen/lateinit/notInitialized.kt"
 }
 
-task AbstractMutableCollectionRemoveAll(type: RunKonanTest) {
+task AbstractMutableCollection(type: RunKonanTest) {
     expectedExitStatus = 0
-    source = "runtime/collections/AbstractMutableCollectionRemoveAll.kt"
+    source = "runtime/collections/AbstractMutableCollection.kt"
 }
 
 task array0(type: RunKonanTest) {

backend.native/tests/external/stdlib/collections/CollectionTest/sortByInPlace.kt

@@ -8,7 +8,7 @@ inline fun <T, R : Comparable<R>> assertSorted(list: List<out T>, message: Strin
     }
     val it = list.iterator()
     var prev = selector(it.next())
-    while(it.hasNext()) {
+    while (it.hasNext()) {
         val cur = selector(it.next())
         assertTrue(prev.compareTo(cur) <= 0, message)
         prev = cur
@@ -21,7 +21,7 @@ inline fun <T, R : Comparable<R>> assertSortedDescending(list: List<out T>, mess
     }
     val it = list.iterator()
     var prev = selector(it.next())
-    while(it.hasNext()) {
+    while (it.hasNext()) {
         val cur = selector(it.next())
         assertTrue(prev.compareTo(cur) >= 0, message)
         prev = cur

backend.native/tests/runtime/collections/AbstractMutableCollection.kt

@@ -15,17 +15,6 @@ class TestCollection(): AbstractMutableCollection<Int>() {
         return true
     }
 
-    override fun remove(element: Int): Boolean {
-        val it = iterator()
-        while(it.hasNext()) {
-            if (it.next() == element) {
-                it.remove()
-                return true
-            }
-        }
-        return false
-    }
-
     override fun iterator(): MutableIterator<Int> = object: MutableIterator<Int> {
         var nextIndex = 0
 
@@ -67,4 +56,8 @@ fun main(args: Array<String>) {
     assertEquals(c, listOf(3, 4, 5, 4))
     c.retainAll(listOf(4, 5))
     assertEquals(c, listOf(4, 5, 4))
+    c.remove(4)
+    assertEquals(c, listOf(5, 4))
+    c.clear()
+    assertEquals(c, listOf())
 }