Commits on Oct 2, 2022

1. rustc: Use unix_sigpipe instead of rustc_driver::set_sigpipe_handler …

   This is the first (known) step towards starting to use `unix_sigpipe` in
   the wild. Eventually, `rustc_driver::set_sigpipe_handler` can be removed
   and all clients can use `unix_sigpipe` instead.
   
   For now we just start using `unix_sigpipe` in once place: `rustc`
   itself.
   
   It is easy to manually verify this change. If you remove
   `#[unix_sigpipe = "sig_dfl"]` and run `./x.py build` you will get an ICE
   when you do `./build/x86_64-unknown-linux-gnu/stage1/bin/rustc --help |
   false`. Add back `#[unix_sigpipe = "sig_dfl"]` and the ICE disappears
   again.

   

   Enselic committed Oct 2, 2022
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