KT-75801: Optimize stdlib Array<T>.toList() function

Replace inner `toMutableList()` call with `copyOf().asList()`.
This change reduce number of array copies from two to one.

Author: alexismanin

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

@@ -9831,7 +9831,7 @@ public fun <T> Array<out T>.toList(): List<T> {
     return when (size) {
         0 -> emptyList()
         1 -> listOf(this[0])
-        else -> this.toMutableList()
+        else -> copyOf().asList()
     }
 }
 

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

@@ -173,7 +173,7 @@ object Snapshots : TemplateGroupBase() {
             return this.toMutableList().optimizeReadOnlyList()
             """
         }
-        body(CharSequences, ArraysOfPrimitives, ArraysOfObjects) {
+        body(CharSequences, ArraysOfPrimitives) {
             """
             return when (${f.code.size}) {
                 0 -> emptyList()
@@ -182,6 +182,16 @@ object Snapshots : TemplateGroupBase() {
             }
             """
         }
+        // For object array, ensure a single array copy instead of delegating to `toMutableList`, which can cause two copies (see KT-75801)
+        body(ArraysOfObjects) {
+            """
+            return when (${f.code.size}) {
+                0 -> emptyList()
+                1 -> listOf(this[0])
+                else -> copyOf().asList()
+            }
+            """
+        }
         body(Sequences) { optimizedSequenceToCollection("emptyList", "listOf", "ArrayList") }
         specialFor(Maps) {
             doc { "Returns a [List] containing all key-value pairs." }