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Promote ohos targets to tier2 with host tools. ### 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)](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)](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: https://github.com/rust-lang/compiler-team/issues/811 ### Blockage to be solved? - [x] Submit an MCP - [x] Submit code of promote ohos targets - [x] 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 (https://github.com/rust-lang/measureme/pull/240). [done]
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.