GCC: explicitely instantiate JSObject::ApplyAttributesToDictionary for NumberDictionary

elements.cc invokes ApplyAttributesToDictionary using NumberDictionary as its template
parameter. But the declaration of the template method is in js-object.cc, so nobody
can actually compile the version for number dictionary. This is fixed requesting
explicit instantiation for NumberDictionary.

This was breaking GCC build.

Bug: chromium:819294
Change-Id: I685ddc5b97e129d1a534dbdb04025c0932bc5ecd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1649565
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: José Dapena Paz <jose.dapena@lge.com>
Cr-Commit-Position: refs/heads/master@{#62097}
diff --git a/AUTHORS b/AUTHORS
index 76fc83d..5998831 100644
@@ -15,6 +15,7 @@
 BlackBerry Limited <*@blackberry.com>
 Opera Software ASA <*@opera.com>
 Intel Corporation <*@intel.com>
+LG Electronics, Inc. <*@lge.com>
 Microsoft <*@microsoft.com>
 MIPS Technologies, Inc. <*@mips.com>
 Imagination Technologies, LLC <*@imgtec.com>
diff --git a/src/objects/js-objects.cc b/src/objects/js-objects.cc
index 6e35c47..fa75943 100644
--- a/src/objects/js-objects.cc
+++ b/src/objects/js-objects.cc
@@ -3753,6 +3753,10 @@
+template void JSObject::ApplyAttributesToDictionary(
+    Isolate* isolate, ReadOnlyRoots roots, Handle<NumberDictionary> dictionary,
+    const PropertyAttributes attributes);
 template <PropertyAttributes attrs>
 Maybe<bool> JSObject::PreventExtensionsWithTransition(
     Handle<JSObject> object, ShouldThrow should_throw) {