message: Run regalloc checker on CI
  This would have caught the issue that required releasing Cranelift 0.85.1
diff: @@ -247,6 +247,7 @@ fn build_isa(sess: &Session, backend_config: &BackendConfig) -> Box<dyn isa::Tar
  flags_builder.set("enable_probestack", "false").unwrap(); // __cranelift_probestack is not provided
  let enable_verifier = if backend_config.enable_verifier { "true" } else { "false" };
  flags_builder.set("enable_verifier", enable_verifier).unwrap();
  + flags_builder.set("regalloc_checker", enable_verifier).unwrap();
  let tls_model = match target_triple.binary_format {
  BinaryFormat::Elf => "elf_gd",
  