ArrayBuffer.prototype.byteLength should handle detached interop array buffer.

Author: iamstolis

graal-js/src/com.oracle.truffle.js/src/com/oracle/truffle/js/builtins/ArrayBufferPrototypeBuiltins.java

@@ -140,6 +140,9 @@ protected int directArrayBuffer(Object thisObj) {
         protected int interopArrayBuffer(Object thisObj,
                         @CachedLibrary(limit = "InteropLibraryLimit") InteropLibrary interop) {
             Object buffer = JSArrayBuffer.getInteropBuffer(thisObj);
+            if (!getContext().getTypedArrayNotDetachedAssumption().isValid() && buffer == null) {
+                return handleDetachedBuffer();
+            }
             try {
                 long bufferSize = interop.getBufferSize(buffer);
                 // Buffer size was already checked in the ArrayBuffer constructor.