Value classes: Add isValue property to class descriptors

Reuse isInline flag in proto and IR.
Check metadata version on deserialization.

compiler/frontend/src/org/jetbrains/kotlin/psi/synthetics/SyntheticClassOrObjectDescriptor.kt

@@ -83,6 +83,7 @@ class SyntheticClassOrObjectDescriptor(
     override fun isExpect() = false
     override fun isActual() = false
     override fun isFun() = false
+    override fun isValue() = false
 
     override fun getCompanionObjectDescriptor(): ClassDescriptorWithResolutionScopes? = null
     override fun getTypeConstructor(): TypeConstructor = typeConstructor

compiler/frontend/src/org/jetbrains/kotlin/resolve/lazy/descriptors/LazyClassDescriptor.java

@@ -87,6 +87,7 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements ClassDes
     private final boolean isExpect;
     private final boolean isActual;
     private final boolean isFun;
+    private final boolean isValue;
 
     private final Annotations annotations;
     private final Annotations danglingAnnotations;
@@ -160,6 +161,7 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements ClassDes
                         containingDeclaration instanceof ClassDescriptor && ((ClassDescriptor) containingDeclaration).isExpect();
 
         this.isFun = modifierList != null && PsiUtilsKt.hasFunModifier(modifierList);
+        this.isValue = modifierList != null && PsiUtilsKt.hasValueModifier(modifierList);
 
         // Annotation entries are taken from both own annotations (if any) and object literal annotations (if any)
         List<KtAnnotationEntry> annotationEntries = new ArrayList<>();
@@ -552,6 +554,11 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements ClassDes
         return isFun;
     }
 
+    @Override
+    public boolean isValue() {
+        return isValue;
+    }
+
     @NotNull
     @Override
     public Annotations getAnnotations() {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrBasedDescriptors.kt

@@ -604,6 +604,9 @@ open class IrBasedClassDescriptor(owner: IrClass) : ClassDescriptor, IrBasedDecl
 
     override fun isFun() = owner.isFun
 
+    // In IR, inline and value are synonyms
+    override fun isValue() = owner.isInline
+
     override fun getThisAsReceiverParameter() = owner.thisReceiver?.toIrBasedDescriptor() as ReceiverParameterDescriptor
 
     override fun getUnsubstitutedPrimaryConstructor() =
@@ -704,6 +707,8 @@ open class IrBasedEnumEntryDescriptor(owner: IrEnumEntry) : ClassDescriptor, IrB
 
     override fun isFun() = false
 
+    override fun isValue() = false
+
     override fun getThisAsReceiverParameter() = (owner.parent as IrClass).toIrBasedDescriptor().thisAsReceiverParameter
 
     override fun getUnsubstitutedPrimaryConstructor(): ClassConstructorDescriptor? {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/WrappedDescriptors.kt

@@ -583,6 +583,8 @@ open class WrappedClassDescriptor : ClassDescriptor, WrappedDeclarationDescripto
 
     override fun isFun() = owner.isFun
 
+    override fun isValue() = owner.isInline
+
     override fun getThisAsReceiverParameter() = owner.thisReceiver?.descriptor as ReceiverParameterDescriptor
 
     override fun getUnsubstitutedPrimaryConstructor() =
@@ -682,6 +684,8 @@ open class WrappedScriptDescriptor : ScriptDescriptor, WrappedDeclarationDescrip
 
     override fun isFun() = false
 
+    override fun isValue() = false
+
     override fun getThisAsReceiverParameter() = owner.thisReceiver.descriptor as ReceiverParameterDescriptor
 
     override fun getUnsubstitutedPrimaryConstructor() = TODO()
@@ -822,6 +826,8 @@ open class WrappedEnumEntryDescriptor : ClassDescriptor, WrappedDeclarationDescr
 
     override fun isFun() = false
 
+    override fun isValue() = false
+
     override fun getThisAsReceiverParameter() = (owner.parent as IrClass).descriptor.thisAsReceiverParameter
 
     override fun getUnsubstitutedPrimaryConstructor(): ClassConstructorDescriptor? {

compiler/psi/src/org/jetbrains/kotlin/psi/psiUtil/psiUtils.kt

@@ -452,6 +452,8 @@ fun KtModifierList.hasSuspendModifier() = hasModifier(KtTokens.SUSPEND_KEYWORD)
 
 fun KtModifierList.hasFunModifier() = hasModifier(KtTokens.FUN_KEYWORD)
 
+fun KtModifierList.hasValueModifier() = hasModifier(KtTokens.VALUE_KEYWORD)
+
 fun ASTNode.children() = generateSequence(firstChildNode) { node -> node.treeNext }
 fun ASTNode.parents() = generateSequence(treeParent) { node -> node.treeParent }