Filling holes (and updating hole count) in addRangeImplContiguous().

Author: iamstolis

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/runtime/array/dyn/AbstractWritableArray.java

@@ -680,6 +680,10 @@ ScriptArray addRangeImplContiguous(JSDynamicObject object, long offset, int size
                 int copySize = (lastIndex - effectiveOffset);
                 if (copySize > 0) {
                     System.arraycopy(array, effectiveOffset, array, (effectiveOffset + size), copySize);
+                    fillWithHoles(array, effectiveOffset, effectiveOffset + size);
+                    if (isHolesType()) {
+                        arraySetHoleCount(object, arrayGetHoleCount(object) + size);
+                    }
                 }
                 arraySetUsedLength(object, usedLength + size);
                 return this;