message: let the user skip the sysroot consistency check
diff: @@ -141,6 +141,13 @@ fn test_sysroot_consistency() {
  .unwrap_or_else(|_| panic!("Failed to canonicalize sysroot: {}", stdout))
  }
  + // We let the user skip this check if they really want to.
  + // (`bootstrap` needs this because Miri gets built by the stage1 compiler
  + // but run with the stage2 sysroot.)
  + if std::env::var("MIRI_SKIP_SYSROOT_CHECK").is_ok() {
  + return;
  + }
  +
  let rustc_sysroot = get_sysroot(Command::new("rustc"));
  let miri_sysroot = get_sysroot(Command::new(find_miri()));
  