IR: add type parameter to IrMemberAccessExpression and some subclasses

This is needed to get rid of the diamond hierarchy:

                 IrMemberAccessExpression
                 /                       \
                /                         \
IrFunctionAccessExpression     IrCallableReference
                \                      /
                 \                    /
                   IrFunctionReference

In the subsequent commit, IrFunctionReference no longer inherits from
IrFunctionAccessExpression; the more precise type of `val symbol:
IrFunctionSymbol` is now carried via the generic type argument.

This will help to refactor IR element hierarchy from interfaces to
classes, improving performance of visitors and transformers.

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/BlockDecomposerLowering.kt

@@ -566,7 +566,7 @@ class BlockDecomposerTransformer(
         // var p4_tmp = p4
         // var p5_tmp = block {}
         // d_tmp.foo(p1_tmp, p2_tmp, p3_tmp, p4_tmp, p5_tmp, p6, p7)
-        override fun visitMemberAccess(expression: IrMemberAccessExpression): IrExpression {
+        override fun visitMemberAccess(expression: IrMemberAccessExpression<*>): IrExpression {
             expression.transformChildrenVoid(expressionTransformer)
 
             val oldArguments = mutableListOf(expression.dispatchReceiver, expression.extensionReceiver)

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PrivateMembersLowering.kt

@@ -218,9 +218,9 @@ class PrivateMemberBodiesLowering(val context: JsIrBackendContext) : BodyLowerin
             }
 
             private fun transformPrivateToStaticReference(
-                expression: IrCallableReference,
-                builder: () -> IrCallableReference
-            ): IrCallableReference {
+                expression: IrCallableReference<*>,
+                builder: () -> IrCallableReference<*>
+            ): IrCallableReference<*> {
 
                 val newExpression = builder()
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/StateMachineBuilder.kt

@@ -503,7 +503,7 @@ class StateMachineBuilder(
         return newArguments
     }
 
-    override fun visitMemberAccess(expression: IrMemberAccessExpression) {
+    override fun visitMemberAccess(expression: IrMemberAccessExpression<*>) {
 
         if (expression !in suspendableNodes) {
             addExceptionEdge()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/jsAstUtils.kt

@@ -201,7 +201,7 @@ fun translateCall(
     }
 }
 
-fun translateCallArguments(expression: IrMemberAccessExpression, context: JsGenerationContext, transformer: IrElementToJsExpressionTransformer): List<JsExpression> {
+fun translateCallArguments(expression: IrMemberAccessExpression<*>, context: JsGenerationContext, transformer: IrElementToJsExpressionTransformer): List<JsExpression> {
     val size = expression.valueArgumentsCount
 
     val arguments = (0 until size).mapTo(ArrayList(size)) { index ->