Correct descriptor shape for @JvmRecord annotated classes

This commit adds relevant functions: hashCode, toString, equals
(if the class is not a data class)
And supertype j.l.Record

It only affects descriptor contents, i.e. works for FE

^KT-43677 In Progress

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/JvmAdditionalClassPartsProvider.kt

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.resolve.jvm
+
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
+import org.jetbrains.kotlin.descriptors.ClassDescriptor
+import org.jetbrains.kotlin.descriptors.SimpleFunctionDescriptor
+import org.jetbrains.kotlin.incremental.components.LookupLocation
+import org.jetbrains.kotlin.incremental.components.NoLookupLocation
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.AdditionalClassPartsProvider
+import org.jetbrains.kotlin.resolve.FunctionsFromAny
+import org.jetbrains.kotlin.resolve.descriptorUtil.module
+import org.jetbrains.kotlin.resolve.descriptorUtil.resolveTopLevelClass
+import org.jetbrains.kotlin.resolve.jvm.annotations.isJvmRecord
+import org.jetbrains.kotlin.types.KotlinType
+
+class JvmAdditionalClassPartsProvider : AdditionalClassPartsProvider {
+    override fun generateAdditionalMethods(
+        thisDescriptor: ClassDescriptor,
+        result: MutableCollection<SimpleFunctionDescriptor>,
+        name: Name,
+        location: LookupLocation,
+        fromSupertypes: Collection<SimpleFunctionDescriptor>
+    ) {
+        if (thisDescriptor.isJvmRecord()) {
+            FunctionsFromAny.addFunctionFromAnyIfNeeded(thisDescriptor, result, name, fromSupertypes)
+        }
+    }
+
+    override fun getAdditionalSupertypes(
+        thisDescriptor: ClassDescriptor,
+        existingSupertypes: List<KotlinType>
+    ): List<KotlinType> {
+        if (thisDescriptor.isJvmRecord() && existingSupertypes.none(::isJavaLangRecordType)) {
+            thisDescriptor.module.resolveTopLevelClass(JAVA_LANG_RECORD_FQ_NAME, NoLookupLocation.FOR_DEFAULT_IMPORTS)?.defaultType?.let {
+                return listOf(it)
+            }
+        }
+
+        return emptyList()
+    }
+}
+
+private fun isJavaLangRecordType(it: KotlinType) =
+    KotlinBuiltIns.isConstructedFromGivenClass(it, JAVA_LANG_RECORD_FQ_NAME)

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/platform/JvmPlatformConfigurator.kt

@@ -110,6 +110,7 @@ object JvmPlatformConfigurator : PlatformConfiguratorBase(
         container.useImpl<JvmPlatformOverloadsSpecificityComparator>()
         container.useImpl<JvmDefaultSuperCallChecker>()
         container.useImpl<JvmSamConversionOracle>()
+        container.useImpl<JvmAdditionalClassPartsProvider>()
         container.useInstance(FunctionWithBigAritySupport.LanguageVersionDependent)
         container.useInstance(GenericArrayClassLiteralSupport.Enabled)
         container.useInstance(JavaActualAnnotationArgumentExtractor())