Bug 1588748 - Make an scroll anchoring assertion a release assert. r=dholbert

This should prevent this being exploitable, should this fire.

Differential Revision: https://phabricator.services.mozilla.com/D49273

--HG--
extra : moz-landing-system : lando

layout/generic/ScrollAnchorContainer.cpp

@@ -376,7 +376,7 @@ void ScrollAnchorContainer::ApplyAdjustments() {
     }
   }
 
-  MOZ_ASSERT(!mApplyingAnchorAdjustment);
+  MOZ_RELEASE_ASSERT(!mApplyingAnchorAdjustment);
   // We should use AutoRestore here, but that doesn't work with bitfields
   mApplyingAnchorAdjustment = true;
   mScrollFrame->ScrollTo(mScrollFrame->GetScrollPosition() + physicalAdjustment,