[Serialization] Fix invalid int array creation

plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/BaseIrGenerator.kt

@@ -177,8 +177,8 @@ abstract class BaseIrGenerator(private val currentClass: IrClass, final override
                 +irInvoke(
                     null,
                     throwMissedFieldExceptionArrayFunc!!,
-                    createPrimitiveArrayOfExpression(compilerContext.irBuiltIns.intType, goldenMaskList.indices.map { irGet(seenVars[it]) }),
-                    createPrimitiveArrayOfExpression(compilerContext.irBuiltIns.intType, goldenMaskList.map { irInt(it) }),
+                    createIntArrayOfExpression(goldenMaskList.indices.map { irGet(seenVars[it]) }),
+                    createIntArrayOfExpression(goldenMaskList.map { irInt(it) }),
                     serialDescriptor,
                     typeHint = compilerContext.irBuiltIns.unitType
                 )

plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/backend/ir/IrBuilderWithPluginContext.kt

@@ -214,15 +214,11 @@ interface IrBuilderWithPluginContext {
         }
     }
 
-    fun IrBuilderWithScope.createPrimitiveArrayOfExpression(
-        elementPrimitiveType: IrType,
-        arrayElements: List<IrExpression>
-    ): IrExpression {
-        val arrayType = compilerContext.irBuiltIns.primitiveArrayForType.getValue(elementPrimitiveType).defaultType
-        val arg0 = IrVarargImpl(startOffset, endOffset, arrayType, elementPrimitiveType, arrayElements)
-        val typeArguments = listOf(elementPrimitiveType)
-
-        return irCall(compilerContext.irBuiltIns.arrayOf, arrayType, typeArguments = typeArguments).apply {
+    fun IrBuilderWithScope.createIntArrayOfExpression(arrayElements: List<IrExpression>): IrExpression {
+        val elementType = compilerContext.irBuiltIns.intType
+        val arrayType = compilerContext.intArrayOfFunctionSymbol.owner.returnType
+        val arg0 = IrVarargImpl(startOffset, endOffset, arrayType, elementType, arrayElements)
+        return irCall(compilerContext.intArrayOfFunctionSymbol, arrayType).apply {
             putValueArgument(0, arg0)
         }
     }

plugins/kotlinx-serialization/kotlinx-serialization.backend/src/org/jetbrains/kotlinx/serialization/compiler/extensions/SerializationLoweringExtension.kt

@@ -18,10 +18,7 @@ import org.jetbrains.kotlin.builtins.StandardNames
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
-import org.jetbrains.kotlin.ir.util.defaultType
-import org.jetbrains.kotlin.ir.util.findDeclaration
-import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
-import org.jetbrains.kotlin.ir.util.getPropertyGetter
+import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
@@ -65,6 +62,9 @@ class SerializationPluginContext(baseContext: IrPluginContext, val metadataPlugi
     internal val arrayValueGetter = irBuiltIns.arrayClass.owner.declarations.filterIsInstance<IrSimpleFunction>()
         .single { it.name.asString() == "get" }
 
+    internal val intArrayOfFunctionSymbol =
+        referenceFunctions(CallableId(StandardNames.BUILT_INS_PACKAGE_FQ_NAME, Name.identifier("intArrayOf"))).first()
+
     // Kotlin stdlib declarations
     internal val jvmFieldClassSymbol = referenceClass(StandardClassIds.Annotations.JvmField)!!