Promote aarch64-pc-windows-msvc to Tier 1

[dpaoliello]

Per rust-lang/rfcs#3817

Tracking issue: #145671

[rustbot]

r? @ehuss

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[rustbot]

This PR changes how LLVM is built. Consider updating src/bootstrap/download-ci-llvm-stamp.

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

cc @Noratrieb

[ehuss]

Don't forget to update the target value:

rust/compiler/rustc_target/src/spec/targets/aarch64_pc_windows_msvc.rs

Line 18 in 040a98a

tier: Some(2),

[ehuss]

r? @Noratrieb maybe?

[rustbot]

Noratrieb is not on the review rotation at the moment.
They may take a while to respond.

[rustbot]

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

[dpaoliello]

Don't forget to update the target value:

rust/compiler/rustc_target/src/spec/targets/aarch64_pc_windows_msvc.rs

Line 18 in 040a98a

tier: Some(2),

Thanks! I did this change based on the aarch64-darwin promotion, but I guess this is new?

[dpaoliello]

Looks like infra failures in the CI job?

The job was not acquired by Runner of type hosted even after multiple attempts

[jieyouxu]

Githuh had an outage earlier