Trigger OOM crash if no memory returned in v8::ArrayBuffer::New and v8::SharedArrayBuffer::New.

This API does not allow reporting failure, but we should crash rather than have
the caller get an ArrayBuffer that isn't properly set up.

BUG=chromium:681843

Review-Url: https://codereview.chromium.org/2641953002
Cr-Commit-Position: refs/heads/master@{#42511}

src/api.cc

@@ -7575,7 +7575,11 @@ Local<ArrayBuffer> v8::ArrayBuffer::New(Isolate* isolate, size_t byte_length) {
   ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
   i::Handle<i::JSArrayBuffer> obj =
       i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
-  i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length);
+  // TODO(jbroman): It may be useful in the future to provide a MaybeLocal
+  // version that throws an exception or otherwise does not crash.
+  if (!i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length)) {
+    i::FatalProcessOutOfMemory("v8::ArrayBuffer::New");
+  }
   return Utils::ToLocal(obj);
 }
 
@@ -7765,8 +7769,12 @@ Local<SharedArrayBuffer> v8::SharedArrayBuffer::New(Isolate* isolate,
   ENTER_V8_NO_SCRIPT_NO_EXCEPTION(i_isolate);
   i::Handle<i::JSArrayBuffer> obj =
       i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kShared);
-  i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length, true,
-                                        i::SharedFlag::kShared);
+  // TODO(jbroman): It may be useful in the future to provide a MaybeLocal
+  // version that throws an exception or otherwise does not crash.
+  if (!i::JSArrayBuffer::SetupAllocatingData(obj, i_isolate, byte_length, true,
+                                             i::SharedFlag::kShared)) {
+    i::FatalProcessOutOfMemory("v8::SharedArrayBuffer::New");
+  }
   return Utils::ToLocalShared(obj);
 }