allow disabling of ArrayBuffer neutering

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index c0814a80cb0e184db7cc4e880a697b560bd85a11..a049fb9e9650ff7bde5b90a4b08f16f5d470290a 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -16365,6 +16365,7 @@ void JSDate::SetCachedFields(int64_t local_time_ms, DateCache* date_cache) {
 
 
 void JSArrayBuffer::Neuter() {
+  DCHECK(is_neuterable());

[Dmitry Lomov (no reviews), 2014/10/29 10:15:38]

Change to CHECK - this should fail in release as well.
(feel free to change DCHECK to CHECK in DCHECK(is_external()) below)

   DCHECK(is_external());
   set_backing_store(NULL);
   set_byte_length(Smi::FromInt(0));
@@ -16372,6 +16373,7 @@ void JSArrayBuffer::Neuter() {
 
 
 void JSArrayBufferView::NeuterView() {
+  DCHECK(JSArrayBuffer::cast(buffer())->is_neuterable());

[Dmitry Lomov (no reviews), 2014/10/29 10:15:38]

Change to CHECK - this should fail in release as well.

   set_byte_offset(Smi::FromInt(0));
   set_byte_length(Smi::FromInt(0));
 }