Enable various hardening checks in absl which would otherwise be UB.
---
diff --git a/third_party/abseil-cpp/absl/base/options.h b/third_party/abseil-cpp/absl/base/options.h
index 71bafb39f2124..212891c5067f1 100644
--- a/third_party/abseil-cpp/absl/base/options.h
+++ b/third_party/abseil-cpp/absl/base/options.h
@@ -179,6 +179,6 @@
 // checks enabled by this option may abort the program in a different way and
 // log additional information when `NDEBUG` is not defined.

-#define ABSL_OPTION_HARDENED 0
+#define ABSL_OPTION_HARDENED 1

 #endif  // ABSL_BASE_OPTIONS_H_