Added support of external serializers to the FIR

Co-authored-by: Leonid Startsev <leonid.startsev@jetbrains.com>
Merge-request: KT-MR-7334
Merged-by: Sergey Shanshin <Sergey.Shanshin@jetbrains.com>

plugins/kotlinx-serialization/testData/diagnostics/ExternalSerializers.fir.fail

@@ -1,3 +0,0 @@
-An operation is not implemented: Support @Serializer(for=...) supertype generation
-kotlin.NotImplementedError: An operation is not implemented: Support @Serializer(for=...) supertype generation
-	at org.jetbrains.kotlinx.serialization.compiler.fir.SerializationFirSupertypesExtension.computeAdditionalSupertypes(SerializationFirSupertypesExtension.kt:39)

plugins/kotlinx-serialization/testData/diagnostics/ExternalSerializers.fir.kt

@@ -1,9 +0,0 @@
-// SKIP_TXT
-
-// FILE: test.kt
-import kotlinx.serialization.*
-
-class Foo(i: Int, val j: Int)
-
-@Serializer(forClass = Foo::class)
-object ExternalSerializer

plugins/kotlinx-serialization/testData/diagnostics/ExternalSerializers.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // SKIP_TXT
 
 // FILE: test.kt

plugins/kotlinx-serialization/testData/diagnostics/LazyRecursionBug.fir.kt

@@ -1,9 +0,0 @@
-// This test enshures that analysis ends up without compiler exceptions
-
-import kotlinx.serialization.*
-
-@Serializable
-class Digest() {
-    @Serializer(forClass = Digest::class)
-    companion <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object<!> : KSerializer<Digest> {}
-}

plugins/kotlinx-serialization/testData/diagnostics/LazyRecursionBug.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // This test enshures that analysis ends up without compiler exceptions
 
 import kotlinx.serialization.*

plugins/kotlinx-serialization/testData/diagnostics/SerializerTypeCompatibleForSpecials.fir.kt

@@ -1,18 +0,0 @@
-// WITH_STDLIB
-// SKIP_TXT
-
-import kotlinx.serialization.*
-
-class Bar
-@Serializer(forClass = Bar::class)
-<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object BarSerializer<!>: KSerializer<Bar>
-
-class Baz
-@Serializer(forClass = Baz::class)
-<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object BazSerializer<!>: KSerializer<Baz>
-
-@Serializable
-class Foo1(@Polymorphic val i: Baz)
-
-@Serializable
-class Foo2(val li: MutableList<@Serializable(with = BazSerializer::class) Baz>)

plugins/kotlinx-serialization/testData/diagnostics/SerializerTypeCompatibleForSpecials.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // WITH_STDLIB
 // SKIP_TXT
 

plugins/kotlinx-serialization/testData/diagnostics/SerializerTypeIncompatible.fir.kt

@@ -5,13 +5,13 @@ import kotlinx.serialization.*
 
 class Bar
 @Serializer(forClass = Bar::class)
-<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object BarSerializer<!>: KSerializer<Bar>
+object BarSerializer: KSerializer<Bar>
 
 class Baz
 @Serializer(forClass = Baz::class)
-<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object BazSerializer<!>: KSerializer<Baz>
+object BazSerializer: KSerializer<Baz>
 @Serializer(forClass = Baz::class)
-<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object NullableBazSerializer<!>: KSerializer<Baz?>
+object NullableBazSerializer: KSerializer<Baz?>
 
 <!SERIALIZER_TYPE_INCOMPATIBLE!>@Serializable(with = BazSerializer::class)<!>
 class Biz(val i: Int)