[BE] Put context receivers before an extension receiver

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrFunction.kt

@@ -48,6 +48,8 @@ abstract class IrFunction :
 
     abstract var body: IrBody?
 
+    var contextReceiverParametersCount: Int = 0
+
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         typeParameters.forEach { it.accept(visitor, data) }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrFunctionAccessExpression.kt

@@ -19,6 +19,8 @@ abstract class IrFunctionAccessExpression(
     final override val valueArgumentsCount: Int
         get() = argumentsByParameterIndex.size
 
+    var contextReceiversCount: Int = 0
+
     override fun getValueArgument(index: Int): IrExpression? {
         if (index >= valueArgumentsCount) {
             throwNoSuchArgumentSlotException("value", index, valueArgumentsCount)