Lower fun interface children's body during inline class lowering

#KT-51121 Fixed

compiler/testData/codegen/box/inlineClasses/funInterface/kt51121.kt

@@ -0,0 +1,19 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses
+// IGNORE_BACKEND: JVM
+// FILE: 1.kt
+
+fun interface F {
+    fun foo(s: String): Z
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class Z(val value: String)
+
+// FILE: 2.kt
+
+val f: F = F { value -> Z(value) }
+
+fun box(): String =
+    f.foo("OK").value

compiler/testData/codegen/box/inlineClasses/funInterface/kt51121_2.kt

@@ -0,0 +1,20 @@
+// WITH_STDLIB
+// WORKS_WHEN_VALUE_CLASS
+// LANGUAGE: +ValueClasses
+// IGNORE_BACKEND: JVM
+// FILE: 1.kt
+
+val f: F = F { value -> Z(value) }
+
+fun box(): String =
+    f.foo("OK").value
+
+// FILE: 2.kt
+
+fun interface F {
+    fun foo(s: String): Z
+}
+
+OPTIONAL_JVM_INLINE_ANNOTATION
+value class Z(val value: String)
+