Add new Tier-3 targets: loongarch32-unknown-none*

[heiher]

MCP: rust-lang/compiler-team#865

NOTE: LoongArch32 ELF object support is available starting with object v0.37.0.

[rustbot]

r? @wesleywiser

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[rustbot]

Some changes occurred in src/doc/rustc/src/platform-support

cc @Noratrieb

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

The Miri subtree was changed

cc @rust-lang/miri

Some changes occurred in src/tools/compiletest

cc @jieyouxu

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

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

[wesleywiser]

Thanks @heiher!

@bors r+ rollup

[bors]

📌 Commit 38d69c3 has been approved by wesleywiser

It is now in the queue for this repository.