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/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileDeserializer.kt

@@ -331,7 +331,7 @@ abstract class IrFileDeserializer(
         return IrBlockImpl(start, end, type, origin, statements)
     }
 
-    private fun deserializeMemberAccessCommon(access: IrMemberAccessExpression, proto: ProtoMemberAccessCommon) {
+    private fun deserializeMemberAccessCommon(access: IrMemberAccessExpression<*>, proto: ProtoMemberAccessCommon) {
 
         proto.valueArgumentList.mapIndexed { i, arg ->
             if (arg.hasExpression()) {

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFileSerializer.kt

@@ -472,7 +472,7 @@ open class IrFileSerializer(
         return proto.build()
     }
 
-    private fun serializeMemberAccessCommon(call: IrMemberAccessExpression): ProtoMemberAccessCommon {
+    private fun serializeMemberAccessCommon(call: IrMemberAccessExpression<*>): ProtoMemberAccessCommon {
         val proto = ProtoMemberAccessCommon.newBuilder()
         if (call.extensionReceiver != null) {
             proto.extensionReceiver = serializeExpression(call.extensionReceiver!!)