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Rollup merge of #136530 - Kobzol:x-perf, r=onur-ozkan 

Implement `x perf` directly in bootstrap

Discussed [here](https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/Turning.20.60x.20perf.60.20into.20a.20first.20class.20command).

Implementing the command directly in bootstrap let's us correctly build the compiler toolchain based on input arguments (such as include rustdoc in the toolchain [only] when needed), and it also makes the CLI interface nicer.

r? ``@onur-ozkan``
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@ -7,9 +7,7 @@ However, using the suite manually can be a bit cumbersome. To make this easier f
the compiler build system (`bootstrap`) also provides built-in integration with the benchmarking suite,
which will download and build the suite for you, build a local compiler toolchain and let you profile it using a simplified command-line interface.
You can use the `./x perf -- <command> [options]` command to use this integration.
> Note that you need to specify arguments after `--` in the `x perf` command! You will not be able to pass arguments without the double dashes.
You can use the `./x perf <command> [options]` command to use this integration.
You can use normal bootstrap flags for this command, such as `--stage 1` or `--stage 2`, for example to modify the stage of the created sysroot. It might also be useful to configure `config.toml` to better support profiling, e.g. set `rust.debuginfo-level = 1` to add source line information to the built compiler.