Transform some builtin methods

1. CharSequence.charAt -> get
2. ML.remove(Int) -> removeAt,
3. MC.remove(Any?) -> MC.remove(E)

compiler/frontend/src/org/jetbrains/kotlin/resolve/constants/evaluate/OperationsMapGenerated.kt

@@ -348,7 +348,6 @@ internal val binaryOperations: HashMap<BinaryOperationKey<*, *>, Pair<Function2<
     binaryOperation(SHORT, LONG, "times", { a, b -> a.times(b) }, { a, b -> a.multiply(b) }),
     binaryOperation(SHORT, SHORT, "times", { a, b -> a.times(b) }, { a, b -> a.multiply(b) }),
     binaryOperation(SHORT, ANY, "equals", { a, b -> a.equals(b) }, emptyBinaryFun),
-    binaryOperation(STRING, INT, "charAt", { a, b -> a.charAt(b) }, emptyBinaryFun),
     binaryOperation(STRING, STRING, "compareTo", { a, b -> a.compareTo(b) }, emptyBinaryFun),
     binaryOperation(STRING, INT, "get", { a, b -> a.get(b) }, emptyBinaryFun),
     binaryOperation(STRING, ANY, "plus", { a, b -> a.plus(b) }, emptyBinaryFun),

compiler/testData/builtin-classes.txt

@@ -262,7 +262,7 @@ public final class CharRange : kotlin.Range<kotlin.Char>, kotlin.Progression<kot
 }
 
 public interface CharSequence {
-    public abstract fun charAt(/*0*/ index: kotlin.Int): kotlin.Char
+    public abstract operator fun get(/*0*/ index: kotlin.Int): kotlin.Char
     public abstract fun length(): kotlin.Int
     public abstract fun subSequence(/*0*/ start: kotlin.Int, /*1*/ end: kotlin.Int): kotlin.CharSequence
 }
@@ -961,7 +961,7 @@ public interface MutableCollection</*0*/ E> : kotlin.Collection<E>, kotlin.Mutab
     public abstract override /*1*/ /*fake_override*/ fun contains(/*0*/ o: E): kotlin.Boolean
     public abstract override /*1*/ /*fake_override*/ fun containsAll(/*0*/ c: kotlin.Collection<E>): kotlin.Boolean
     public abstract override /*2*/ fun iterator(): kotlin.MutableIterator<E>
-    public abstract fun remove(/*0*/ o: kotlin.Any?): kotlin.Boolean
+    public abstract fun remove(/*0*/ o: E): kotlin.Boolean
     public abstract fun removeAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
     public abstract fun retainAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
 }
@@ -994,9 +994,9 @@ public interface MutableList</*0*/ E> : kotlin.List<E>, kotlin.MutableCollection
     public abstract override /*1*/ /*fake_override*/ fun lastIndexOf(/*0*/ o: kotlin.Any?): kotlin.Int
     public abstract override /*1*/ fun listIterator(): kotlin.MutableListIterator<E>
     public abstract override /*1*/ fun listIterator(/*0*/ index: kotlin.Int): kotlin.MutableListIterator<E>
-    public abstract override /*1*/ fun remove(/*0*/ o: kotlin.Any?): kotlin.Boolean
+    public abstract override /*1*/ fun remove(/*0*/ o: E): kotlin.Boolean
-    public abstract fun remove(/*0*/ index: kotlin.Int): E
     public abstract override /*1*/ fun removeAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
+    public abstract fun removeAt(/*0*/ index: kotlin.Int): E
     public abstract override /*1*/ fun retainAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
     public abstract operator fun set(/*0*/ index: kotlin.Int, /*1*/ element: E): E
     public abstract override /*1*/ fun subList(/*0*/ fromIndex: kotlin.Int, /*1*/ toIndex: kotlin.Int): kotlin.MutableList<E>
@@ -1050,7 +1050,7 @@ public interface MutableSet</*0*/ E> : kotlin.Set<E>, kotlin.MutableCollection<E
     public abstract override /*2*/ /*fake_override*/ fun contains(/*0*/ o: E): kotlin.Boolean
     public abstract override /*2*/ /*fake_override*/ fun containsAll(/*0*/ c: kotlin.Collection<E>): kotlin.Boolean
     public abstract override /*2*/ fun iterator(): kotlin.MutableIterator<E>
-    public abstract override /*1*/ fun remove(/*0*/ o: kotlin.Any?): kotlin.Boolean
+    public abstract override /*1*/ fun remove(/*0*/ o: E): kotlin.Boolean
     public abstract override /*1*/ fun removeAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
     public abstract override /*1*/ fun retainAll(/*0*/ c: kotlin.Collection<kotlin.Any?>): kotlin.Boolean
 }
@@ -1255,9 +1255,8 @@ public final class ShortRange : kotlin.Range<kotlin.Short>, kotlin.Progression<k
 
 public final class String : kotlin.Comparable<kotlin.String>, kotlin.CharSequence {
     /*primary*/ public constructor String()
-    public open override /*1*/ fun charAt(/*0*/ index: kotlin.Int): kotlin.Char
     public open override /*1*/ fun compareTo(/*0*/ other: kotlin.String): kotlin.Int
-    public final operator fun get(/*0*/ index: kotlin.Int): kotlin.Char
+    public open override /*1*/ fun get(/*0*/ index: kotlin.Int): kotlin.Char
     public open override /*1*/ fun length(): kotlin.Int
     public final operator fun plus(/*0*/ other: kotlin.Any?): kotlin.String
     public open override /*1*/ fun subSequence(/*0*/ start: kotlin.Int, /*1*/ end: kotlin.Int): kotlin.CharSequence

core/builtins/native/kotlin/CharSequence.kt

@@ -28,7 +28,7 @@ public interface CharSequence {
     /**
      * Returns the character at the specified [index] in the sequence.
      */
-    public fun charAt(index: Int): Char
+    public operator fun get(index: Int): Char
 
     /**
      * Returns a subsequence of this sequence.

core/builtins/native/kotlin/Collections.kt

@@ -91,7 +91,7 @@ public interface MutableCollection<E> : Collection<E>, MutableIterable<E> {
      *
      * @return `true` if the element has been successfully removed; `false` if it was not present in the collection.
      */
-    public fun remove(o: Any?): Boolean
+    public fun remove(o: E): Boolean
 
     // Bulk Modification Operations
     /**
@@ -181,7 +181,7 @@ public interface List<out E> : Collection<E> {
 public interface MutableList<E> : List<E>, MutableCollection<E> {
     // Modification Operations
     override fun add(e: E): Boolean
-    override fun remove(o: Any?): Boolean
+    override fun remove(o: E): Boolean
 
     // Bulk Modification Operations
     override fun addAll(c: Collection<E>): Boolean
@@ -214,7 +214,7 @@ public interface MutableList<E> : List<E>, MutableCollection<E> {
      *
      * @return the element that has been removed.
      */
-    public fun remove(index: Int): E
+    public fun removeAt(index: Int): E
 
     // List Iterators
     override fun listIterator(): MutableListIterator<E>
@@ -252,7 +252,7 @@ public interface MutableSet<E> : Set<E>, MutableCollection<E> {
 
     // Modification Operations
     override fun add(e: E): Boolean
-    override fun remove(o: Any?): Boolean
+    override fun remove(o: E): Boolean
 
     // Bulk Modification Operations
     override fun addAll(c: Collection<E>): Boolean

core/builtins/native/kotlin/String.kt

@@ -28,14 +28,9 @@ public class String : Comparable<String>, CharSequence {
      */
     public operator fun plus(other: Any?): String
 
-    /**
-     * Returns the character at the specified [index].
-     */
-    public operator fun get(index: Int): Char
-
     public override fun length(): Int
 
-    public override fun charAt(index: Int): Char
+    public override fun get(index: Int): Char
 
     public override fun subSequence(start: Int, end: Int): CharSequence