Rollup merge of #159270 - Kobzol:bootstrap-panic, r=jieyouxu Only force backtraces when a panic occurs in bootstrap In https://github.com/rust-lang/rust/pull/159040, I forced a backtrace to be printed in bootstrap when a panic happens. However, since bootstrap also captures backtraces manually during command execution, this meant that backtraces started to be printed during "normal" bootstrap failures (e.g. if tidy returned a failure), which is annoying. This PR changes it so that the override only happens ona actual panics. Note: bootstrap still uses a lot of panics for "normal" error conditions during a build, rather than for actual bugs or weird bootstrap situations. Those should ideally be replaced with `exit!(1)`.
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