JVM IR: Mark annotation implementation classes as anonymous

And add tests to ensure that annotation implementation classes are
handled correctly in jvm-abi-gen.

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.backend.jvm.codegen
 
+import org.jetbrains.kotlin.backend.common.lower.ANNOTATION_IMPLEMENTATION
 import org.jetbrains.kotlin.backend.common.psi.PsiSourceManager
 import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.JvmLoweredDeclarationOrigin
@@ -450,7 +451,7 @@ class ClassCodegen private constructor(
         for (klass in innerClasses) {
             val innerClass = typeMapper.classInternalName(klass)
             val outerClass =
-                if (klass.isSamWrapper || klass.attributeOwnerId in context.isEnclosedInConstructor)
+                if (klass.isSamWrapper || klass.isAnnotationImplementation || klass.attributeOwnerId in context.isEnclosedInConstructor)
                     null
                 else {
                     when (val parent = klass.parent) {
@@ -465,7 +466,7 @@ class ClassCodegen private constructor(
     }
 
     private val IrClass.isAnonymousInnerClass: Boolean
-        get() = isSamWrapper || name.isSpecial // NB '<Continuation>' is treated as anonymous inner class here
+        get() = isSamWrapper || name.isSpecial || isAnnotationImplementation // NB '<Continuation>' is treated as anonymous inner class here
 
     private val IrClass.isInlineSamWrapper: Boolean
         get() = isSamWrapper && visibility == DescriptorVisibilities.PUBLIC
@@ -473,6 +474,9 @@ class ClassCodegen private constructor(
     private val IrClass.isSamWrapper: Boolean
         get() = origin == IrDeclarationOrigin.GENERATED_SAM_IMPLEMENTATION
 
+    private val IrClass.isAnnotationImplementation: Boolean
+        get() = origin == ANNOTATION_IMPLEMENTATION
+
     override fun addInnerClassInfoFromAnnotation(innerClass: IrClass) {
         // It's necessary for proper recovering of classId by plain string JVM descriptor when loading annotations
         // See FileBasedKotlinClass.convertAnnotationVisitor

compiler/testData/codegen/bytecodeListing/annotations/annotationCtorCallGenerateSynthetic.txt

@@ -1,21 +1,22 @@
 @kotlin.Metadata
 public synthetic final class AnnotationCtorCallGenerateSyntheticKt$annotationImpl$Foo$0 {
     // source: 'annotationCtorCallGenerateSynthetic.kt'
+    enclosing class AnnotationCtorCallGenerateSyntheticKt
     private synthetic final field int: int
+    inner (anonymous) class AnnotationCtorCallGenerateSyntheticKt$annotationImpl$Foo$0
     public method <init>(p0: int): void
     public synthetic final method annotationType(): java.lang.Class
     public final method equals(@org.jetbrains.annotations.Nullable p0: java.lang.Object): boolean
     public final method hashCode(): int
     public synthetic final method int(): int
     public final @org.jetbrains.annotations.NotNull method toString(): java.lang.String
-    public synthetic inner class AnnotationCtorCallGenerateSyntheticKt$annotationImpl$Foo$0
 }
 
 @kotlin.Metadata
 public final class AnnotationCtorCallGenerateSyntheticKt {
     // source: 'annotationCtorCallGenerateSynthetic.kt'
+    inner (anonymous) class AnnotationCtorCallGenerateSyntheticKt$annotationImpl$Foo$0
     public final static method box(): void
-    public synthetic inner class AnnotationCtorCallGenerateSyntheticKt$annotationImpl$Foo$0
 }
 
 @java.lang.annotation.Retention(value=RUNTIME)