Rollup merge of #154616 - erickt:quiet, r=jieyouxu Add `--quiet` flag to x.py and bootstrap to suppress output This adds a `--quiet` flag to x.py and bootstrap to suppress some of the output when compiling Rust. It conflicts with `--verbose`, matching the behavior of `cargo` which does not allow `--verbose` and `--quiet`. It works by passing quiet flags down to the underlying cargo, or LLVM build processes. Note that for LLVM, we only can suppress logs when we explicitly configure it with ninja. Otherwise we won't know what flag to pass along to whichever build system cmake decides to use. This can be helpful with AI workloads in the Rust codebase to help shrink down the output to reduce token usage, which can help prevent context pollution and lower costs. This patch was partially generated with Gemini, but I've reviewed the changes it made.
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