fixup! Migrate ir.interpreter to new IR parameter API A42
diff --git a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/CallInterceptor.kt b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/CallInterceptor.kt
index 5e57967..16eaae2 100644
--- a/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/CallInterceptor.kt
+++ b/compiler/ir/ir.interpreter/src/org/jetbrains/kotlin/ir/interpreter/CallInterceptor.kt
@@ -69,7 +69,7 @@
             // TODO try to create backing field if it is missing
             irFunction.body == null && irFunction.isAccessorOfPropertyWithBackingField() -> {
                 val backingField = irFunction.property!!.backingField!!
-                val getField = backingField.createGetField(irFunction.dispatchReceiverParameter!!)
+                val getField = backingField.createGetField(irFunction.dispatchReceiverParameter)
                 callStack.pushCompoundInstruction(getField)
             }
             irFunction.body == null -> irFunction.trySubstituteFunctionBody() ?: calculateBuiltIns(irFunction, args)