Fix array initialization with array holes (#3076)

Fast mode access arrays must be converted back to normal if the array hole count reaches the limit during the initializtaion.
This patch fixes #3075.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

tests/jerry/regression-test-issue-3072.js

@@ -0,0 +1,18 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var arr = [ , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ];
+arr [4294967294] = 0
+assert (arr.length === 4294967295);
+assert (arr[4294967294] === 0);