Use wrapper class of an inline one as a result for javaClass

#KT-28185 Fixed
 #KT-28246 Open

compiler/backend/src/org/jetbrains/kotlin/codegen/intrinsics/JavaClassProperty.kt

@@ -24,6 +24,8 @@ import org.jetbrains.kotlin.codegen.ExpressionCodegen
 import org.jetbrains.kotlin.codegen.StackValue
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
+import org.jetbrains.kotlin.resolve.isInlineClassType
+import org.jetbrains.kotlin.resolve.jvm.AsmTypes
 import org.jetbrains.kotlin.resolve.jvm.AsmTypes.UNIT_TYPE
 import org.jetbrains.kotlin.resolve.jvm.AsmTypes.getType
 import org.jetbrains.org.objectweb.asm.Type
@@ -42,13 +44,29 @@ object JavaClassProperty : IntrinsicPropertyGetter() {
             }
 
     fun generateImpl(v: InstructionAdapter, receiver: StackValue): Type {
+        fun invokeVirtualGetClassMethod() {
+            v.invokevirtual("java/lang/Object", "getClass", "()Ljava/lang/Class;", false)
+        }
+
         val type = receiver.type
+        val kotlinType = receiver.kotlinType
         when {
             type == Type.VOID_TYPE -> {
                 receiver.put(Type.VOID_TYPE, v)
                 StackValue.unit().put(UNIT_TYPE, v)
-                v.invokevirtual("java/lang/Object", "getClass", "()Ljava/lang/Class;", false)
+                invokeVirtualGetClassMethod()
             }
+
+            kotlinType?.isInlineClassType() == true -> {
+                receiver.put(type, kotlinType, v)
+                StackValue.coerce(
+                    type, kotlinType,
+                    AsmTypes.OBJECT_TYPE, kotlinType.constructor.builtIns.nullableAnyType,
+                    v
+                )
+                invokeVirtualGetClassMethod()
+            }
+
             isPrimitive(type) -> {
                 if (!StackValue.couldSkipReceiverOnStaticCall(receiver)) {
                     receiver.put(type, v)
@@ -56,9 +74,10 @@ object JavaClassProperty : IntrinsicPropertyGetter() {
                 }
                 v.getstatic(boxType(type).internalName, "TYPE", "Ljava/lang/Class;")
             }
+
             else -> {
                 receiver.put(type, v)
-                v.invokevirtual("java/lang/Object", "getClass", "()Ljava/lang/Class;", false)
+                invokeVirtualGetClassMethod()
             }
         }