Auto merge of #27153 - alexcrichton:flaky-tests, r=brson
This commit ensures that the rustc thread does not leak a panic message whenever a call to `fatal` happens. This already happens for the main rustc thread as part of the `rustc_driver::monitor` function, but the compiler also spawns threads for other operations like `-C codegen-units`, and sometimes errors are emitted on these threads as well. To ensure that there's a consistent error-handling experience across threads this unifies these two to never print the panic message in the case of a normal and expected fatal error. This should also fix the flaky `asm-src-loc-codegen-units.rs` test as the output is sometimes garbled if diagnostics are printed while the panic message is also being printed.
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