Rollup merge of #146523 - thejpster:demote-armebv7r-targets, r=jackh726 Demote both armebv7r-none-* targets. OK, slightly more controversial than https://github.com/rust-lang/rust/pull/146520 and https://github.com/rust-lang/rust/pull/146522 - I'd like to drop the bare-metal **big-endian** Armv7-R targets down to Tier 3. The reason is simple - we cannot test them in https://github.com/rust-embedded/cortex-ar/. This because QEMU support for Big Endian Armv7-R is broken. I tried quite hard, but all the strings I printed with semihosting came out byte swapped (or "etybawa depp") because of how QEMU kludges the access to memory in big-endian mode. The target also has only a single maintainer. Although, if ````@chrisnc```` wants to put up a case for keeping it at Tier 2 though, I'm happy to hear it! This PR wil be rebased once https://github.com/rust-lang/rust/pull/146419 completes the queue.
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