Fix rustc --profile=dev unstable check. #9898
Merged
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This fixes an oversight from #9685 where
cargo rustc --profile=dev
was accidentally changed to require-Zunstable-options
. 1.54 and earlier supported that [here](https://github.com/rust-lang/cargo/blob/rust-1.54.0/src/bin/cargo/commands/rustc.rs#L490.Fixes #9897