JVM_IR: fix copying of receivers when unboxing inline class parameters

If an extension receiver is copied into a normal parameter, this may
later cause default argument masks to be shifted.

compiler/testData/compileKotlinAgainstKotlin/defaultWithInlineClassAndReceivers.kt

@@ -0,0 +1,14 @@
+// !LANGUAGE: +InlineClasses
+// FILE: A.kt
+package z
+
+inline class Z(val s: String)
+
+class X {
+    fun Int.foo(z: Z, value: String = "OK") = value
+}
+
+// FILE: B.kt
+import z.*
+
+fun box(): String = with(X()) { 1.foo(Z("")) }