JVM IR: reuse JVM code for reified type parameter mappings instead of copy-paste

core/descriptors/src/org/jetbrains/kotlin/types/TypeSystemCommonBackendContext.kt

@@ -14,6 +14,7 @@ import org.jetbrains.kotlin.types.model.*
 interface TypeSystemCommonBackendContext : TypeSystemContext {
     fun nullableAnyType(): SimpleTypeMarker
     fun arrayType(componentType: KotlinTypeMarker): SimpleTypeMarker
+    fun KotlinTypeMarker.isArrayOrNullableArray(): Boolean
 
     fun TypeConstructorMarker.isFinalClassOrEnumEntryOrAnnotationClassConstructor(): Boolean
 

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -508,6 +508,11 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
         return builtIns.getArrayType(Variance.INVARIANT, componentType)
     }
 
+    override fun KotlinTypeMarker.isArrayOrNullableArray(): Boolean {
+        require(this is KotlinType, this::errorMessage)
+        return KotlinBuiltIns.isArray(this)
+    }
+
     override fun KotlinTypeMarker.hasAnnotation(fqName: FqName): Boolean {
         require(this is KotlinType, this::errorMessage)
         return annotations.hasAnnotation(fqName)