Merge pull request #1942 from Shopify/ba-fix-arr-all

Fix ActiveRecordRelations compiler to dedup #all

lib/tapioca/dsl/compilers/active_record_relations.rb

@@ -190,7 +190,7 @@ def gather_constants
             # Grab all Spawn methods
             query_methods |= ActiveRecord::SpawnMethods.instance_methods(false)
             # Remove the ones we know are private API
-            query_methods -= [:arel, :build_subquery, :construct_join_dependency, :extensions, :spawn]
+            query_methods -= [:all, :arel, :build_subquery, :construct_join_dependency, :extensions, :spawn]
             # Remove "group" which needs a custom return type for GroupChains
             query_methods -= [:group]
             # Remove "where" which needs a custom return type for WhereChains