Bump bdwgc submodule

joncham · joncham · commit 095c003db95c · 2019-09-26T11:16:16.000-04:00
diff --git a/external/bdwgc b/external/bdwgc
@@ -1 +1 @@
-Subproject commit 3ff165d0b48731266dfade9932ea1dd56ad1c60b
+Subproject commit d962884ab8ae4e7b48d9f77b6512c6b580098dc3
