Add checks for detached ArrayBuffers to ArrayBuffer.prototype.slice

src/js/arraybuffer.js

Index: src/js/arraybuffer.js
diff --git a/src/js/arraybuffer.js b/src/js/arraybuffer.js
index f0273c71ed757515a096fa554399bca171857d4c..e739960e5be8a21c063a546c960d8114c2f14967 100644
--- a/src/js/arraybuffer.js
+++ b/src/js/arraybuffer.js
@@ -70,7 +70,9 @@ function ArrayBufferSlice(start, end) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'ArrayBuffer.prototype.slice', result);
   }
-  // TODO(littledan): Check for a detached ArrayBuffer
+  // Checks for detached source/target ArrayBuffers are done inside of
+  // %ArrayBufferSliceImpl; the reordering of checks does not violate
+  // the spec because all exceptions thrown are TypeErrors.
   if (result === this) {
     throw MakeTypeError(kArrayBufferSpeciesThis);
   }