New J2K: Fix nullability preserving in AST conversions

nj2k/src/org/jetbrains/kotlin/nj2k/conversions/ArrayInitializerConversion.kt

@@ -44,7 +44,7 @@ class ArrayInitializerConversion(private val context: ConversionContext) : Recur
                 JKJavaMethodCallExpressionImpl(
                     context.symbolProvider.provideByFqName("kotlin/arrayOfNulls"),
                     JKArgumentListImpl(dimensions[0]),
-                    JKTypeArgumentListImpl(listOf(JKTypeElementImpl(type.updateNullability(Nullability.NotNull))))
+                    JKTypeArgumentListImpl(listOf(JKTypeElementImpl(type)))
                 )
             } else {
                 JKJavaNewExpressionImpl(
@@ -75,7 +75,7 @@ class ArrayInitializerConversion(private val context: ConversionContext) : Recur
             resultType = JKClassTypeImpl(
                 context.symbolProvider.provideByFqName(KotlinBuiltIns.FQ_NAMES.array.asString()),
                 listOf(resultType),
-                Nullability.NotNull
+                Nullability.Default
             )
         }
         return JKJavaMethodCallExpressionImpl(

nj2k/src/org/jetbrains/kotlin/nj2k/conversions/TypeMappingConversion.kt

@@ -107,7 +107,7 @@ class TypeMappingConversion(val context: ConversionContext) : RecursiveApplicabl
                 JKClassTypeImpl(
                     context.symbolProvider.provideByFqName(type.arrayFqName()),
                     if (type is JKJavaPrimitiveType) emptyList() else listOf(type.mapType(typeElement)),
-                    type.nullability
+                    nullability
                 )
             else -> this
         }