reimport pr137735 due to merging check issues (#138959)

This is  a cherry-pick from #137735 by @mikaylagawarecki , that cannot be merged due to a (wrongly) failing check for codev

@diff-train-skip-merge

Pull Request resolved: https://github.com/pytorch/pytorch/pull/138959
Approved by: https://github.com/mikaylagawarecki

build.bzl

@@ -36,7 +36,7 @@ def define_targets(rules):
             "caffe2/serialize/istream_adapter.cc",
             "caffe2/serialize/read_adapter_interface.cc",
         ],
-        copts = ["-fexceptions"],
+        copts = ["-fexceptions", "-DFBCODE_CAFFE2"],
         tags = [
             "-fbcode",
             "supermodule:android/default/pytorch",