Bug 1503664. Keep trying to pin down why ClearDocumentDependentSlots is crashing. r=mccr8

dom/bindings/BindingUtils.cpp

@@ -1070,6 +1070,9 @@ CreateInterfaceObjects(JSContext* cx, JS::Handle<JSObject*> global,
                                      isChrome ? chromeOnlyProperties : nullptr,
                                      unscopableNames, toStringTag, isGlobal);
     if (!proto) {
+      if (name && !strcmp(name, "Document")) {
+        MOZ_CRASH("Bug 1405521/1488480: CreateInterfacePrototypeObject failed for Document.prototype");
+      }
       return;
     }
 
@@ -1088,6 +1091,9 @@ CreateInterfaceObjects(JSContext* cx, JS::Handle<JSObject*> global,
                                       isChrome,
                                       defineOnGlobal);
     if (!interface) {
+      if (name && !strcmp(name, "Document")) {
+        MOZ_CRASH("Bug 1405521/1488480: CreateInterfaceObject failed for Document");
+      }
       if (protoCache) {
         // If we fail we need to make sure to clear the value of protoCache we
         // set above.

dom/bindings/Codegen.py

@@ -3113,6 +3113,9 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
                                         ${name}, aDefineOnGlobal,
                                         ${unscopableNames},
                                         ${isGlobal});
+            if (protoCache && !*protoCache) {
+              $*{maybeCrash}
+            }
             """,
             protoClass=protoClass,
             parentProto=parentProto,
@@ -3127,7 +3130,8 @@ class CGCreateInterfaceObjectsMethod(CGAbstractMethod):
             chromeProperties=chromeProperties,
             name='"' + self.descriptor.interface.identifier.name + '"' if needInterfaceObject else "nullptr",
             unscopableNames="unscopableNames" if self.haveUnscopables else "nullptr",
-            isGlobal=toStringBool(isGlobal))
+            isGlobal=toStringBool(isGlobal),
+            maybeCrash=maybecrash("dom::CreateInterfaceObjects failed for Document"))
 
         # If we fail after here, we must clear interface and prototype caches
         # using this code: intermediate failure must not expose the interface in