Promote ohos targets to tier2 with host tools.

[LuuuXXX]

What does this PR try to resolve?

Try to promote the following [Tier 2 without Host Tools](https://doc.rust-lang.org/rustc/platform-support.html#tier-2-without-host-tools) targets to [Tier 2 with Host Tools](https://doc.rust-lang.org/rustc/platform-support.html#tier-2-with-host-tools):

• aarch64-unknown-linux-ohos
• armv7-unknown-linux-ohos
• x86_64-unknown-linux-ohos

More Information?

see MCP: rust-lang/compiler-team#811

Blockage to be solved?

• Submit an MCP
• Submit code of promote ohos targets
• Resolve related dependencies （measureme）

The modified code of the measureme has been merged （see https://github.com/rust-lang/measureme/pull/238）. [done]
The new version will was released (rust-lang/measureme#240). [done]

[rustbot]

r? @Kobzol

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[rustbot]

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

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.

[LuuuXXX]

The measureme-mirror used to replace the measureme cannot pass the tidy check. It seems that a new measureme version is required.

[Kobzol]

This job runs on the free GitHub runners, so in terms of infra cost, the build time increase should be fine.

[LuuuXXX]

Very appreciate it.