JVM KT-36984 SAM wrappers are anonymous inner classes

compiler/testData/codegen/bytecodeListing/sam/callableRefSpecializedSamInterface.txt

@@ -3,7 +3,9 @@ final class<null>  TKt$sam$Sam$0 {
     // source: 't.kt'
     <null> method <init>(p0: kotlin.jvm.functions.Function0): void
     public synthetic final <null> method get(): java.lang.Object
+    enclosing class TKt
     private synthetic final field <null> function: kotlin.jvm.functions.Function0
+    inner (anonymous) class TKt$sam$Sam$0
 }
 
 @kotlin.Metadata
@@ -23,5 +25,6 @@ public final class<null>  TKt {
     // source: 't.kt'
     public final static @org.jetbrains.annotations.NotNull <null> method foo(): java.lang.String
     public final static @org.jetbrains.annotations.NotNull <null> method specializedSam(): java.lang.String
+    inner (anonymous) class TKt$sam$Sam$0
     inner (anonymous) class TKt$specializedSam$1
 }