[C-interop] Stubs for C functions without parameter names should have non-stable names

^KT-41250

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIr.kt

@@ -490,7 +490,8 @@ data class FunctionStub(
         val receiver: ReceiverParameterStub?,
         val modality: MemberStubModality,
         val typeParameters: List<TypeParameterStub> = emptyList(),
-        val isOverride: Boolean = false
+        val isOverride: Boolean = false,
+        val hasStableParameterNames: Boolean = true
 ) : StubElementWithOrigin, FunctionalStub {
 
     override fun <T, R> accept(visitor: StubIrVisitor<T, R>, data: T) =

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrElementBuilders.kt

@@ -475,9 +475,11 @@ internal class FunctionStubBuilder(
         val platform = context.platform
         val parameters = mutableListOf<FunctionParameterStub>()
 
+        var hasStableParameterNames = true
         func.parameters.forEachIndexed { index, parameter ->
             val parameterName = parameter.name.let {
                 if (it == null || it.isEmpty()) {
+                    hasStableParameterNames = false
                     "arg$index"
                 } else {
                     it
@@ -547,7 +549,8 @@ internal class FunctionStubBuilder(
                 annotations,
                 mustBeExternal,
                 null,
-                MemberStubModality.FINAL
+                MemberStubModality.FINAL,
+                hasStableParameterNames = hasStableParameterNames
         )
         return listOf(functionStub)
     }

Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/StubIrMetadataEmitter.kt

@@ -257,7 +257,8 @@ private class MappingExtensions(
         get() = flagsOfNotNull(
                 Flag.IS_PUBLIC,
                 Flag.Function.IS_EXTERNAL.takeIf { this.external },
-                Flag.HAS_ANNOTATIONS.takeIf { annotations.isNotEmpty() }
+                Flag.HAS_ANNOTATIONS.takeIf { annotations.isNotEmpty() },
+                Flag.Function.HAS_NON_STABLE_PARAMETER_NAMES.takeIf { !this.hasStableParameterNames }
         ) or modality.flags
 
     val Classifier.fqNameSerialized: String