KT-31639: Fix Iterables.drop integer overflow

libraries/stdlib/common/src/generated/_Collections.kt

@@ -614,7 +614,7 @@ public fun <T> Iterable<T>.drop(n: Int): List<T> {
     }
     var count = 0
     for (item in this) {
-        if (count++ >= n) list.add(item)
+        if (count >= n) list.add(item) else ++count
     }
     return list.optimizeReadOnlyList()
 }

libraries/stdlib/jvm/testLongRunning/collections/IndexOverflowJVMTest.kt

@@ -156,4 +156,10 @@ class IndexOverflowJVMTest {
         assertEquals(expectedEnd, dropTake.last())
     }
 
+    @Test
+    fun dropMaxValue() {
+        val range = 0L..Int.MAX_VALUE + 1L
+        assertEquals(listOf(Int.MAX_VALUE.toLong(), Int.MAX_VALUE + 1L), range.drop(Int.MAX_VALUE))
+    }
+
 }

libraries/tools/kotlin-stdlib-gen/src/templates/Filtering.kt

@@ -84,7 +84,7 @@ object Filtering : TemplateGroupBase() {
             }
             var count = 0
             for (item in this) {
-                if (count++ >= n) list.add(item)
+                if (count >= n) list.add(item) else ++count
             }
             return list.optimizeReadOnlyList()
             """