Metadata: 'non-stable parameter names' flag for callables

^KT-34602

compiler/serialization/src/org/jetbrains/kotlin/serialization/DescriptorSerializer.kt

@@ -291,6 +291,14 @@ class DescriptorSerializer private constructor(
         else
             descriptor.visibility
 
+    private fun shouldSerializeHasStableParameterNames(descriptor: CallableMemberDescriptor): Boolean {
+        return when {
+            descriptor.hasStableParameterNames() -> true
+            descriptor.kind == CallableMemberDescriptor.Kind.DELEGATION -> true // remove this line to fix KT-4758
+            else -> false
+        }
+    }
+
     fun functionProto(descriptor: FunctionDescriptor): ProtoBuf.Function.Builder? {
         if (!extension.shouldSerializeFunction(descriptor)) return null
 
@@ -304,7 +312,7 @@ class DescriptorSerializer private constructor(
             ProtoEnumFlags.modality(descriptor.modality),
             ProtoEnumFlags.memberKind(descriptor.kind),
             descriptor.isOperator, descriptor.isInfix, descriptor.isInline, descriptor.isTailrec, descriptor.isExternal,
-            descriptor.isSuspend, descriptor.isExpect
+            descriptor.isSuspend, descriptor.isExpect, shouldSerializeHasStableParameterNames(descriptor)
         )
         if (flags != builder.flags) {
             builder.flags = flags
@@ -367,7 +375,8 @@ class DescriptorSerializer private constructor(
         val local = createChildSerializer(descriptor)
 
         val flags = Flags.getConstructorFlags(
-            hasAnnotations(descriptor), ProtoEnumFlags.visibility(normalizeVisibility(descriptor)), !descriptor.isPrimary
+            hasAnnotations(descriptor), ProtoEnumFlags.visibility(normalizeVisibility(descriptor)), !descriptor.isPrimary,
+            shouldSerializeHasStableParameterNames(descriptor)
         )
         if (flags != builder.flags) {
             builder.flags = flags