PlayStation Vita support

[amgdev9]

Just the compiler definitions for no-std projects. When merged I'll PR again with the std library adaptation.

Earlier pr: #90584

[rustbot]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @JohnTitor (or someone else) soon.

Please see the contribution instructions for more information.

[rustbot]

These commits modify compiler targets.
(See the Target Tier Policy.)

[JohnTitor]

The change including docs LGTM! However, I'd like to r? @wesleywiser as they're the original reviewer.

Meanwhile, could you squash commits into one? We have the "no merge" policy and the large commit history makes it difficult to look back at the history and blame.

[rustbot]

Some changes occured in abstract_const.rs

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Some changes occurred in src/librustdoc/clean/types.rs

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Some changes occurred in src/tools/clippy

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Some changes occurred in need_type_info.rs

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rustc_error_messages was changed

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rustdoc-json-types is a public (although nightly-only) API. If possible, consider changing src/librustdoc/json/conversions.rs; otherwise, make sure you bump the FORMAT_VERSION constant.

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This PR changes MIR

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rustc_macros::diagnostics was changed

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Some changes occurred to MIR optimizations

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Some changes occured in rustc_ty_utils::consts.rs

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Some changes occurred in diagnostic error codes

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Hey! It looks like you've submitted a new PR for the library teams!

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Some changes occurred in engine.rs, potentially modifying the public API of ObligationCtxt.

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Some changes occurred to the CTFE / Miri engine

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Changes rustc_apfloat. rustc_apfloat is currently in limbo and you almost certainly don't want to change it (see #55993).

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A change occurred in the Ayu theme.

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rustc_errors::translation was changed

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[amgdev9]

Sorry, messed up the rebase, reopened in #105712