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[`compiletest`-related cleanups 4/7] Make the distinction between root build directory vs test suite specific build directory in compiletest less confusing Reference for overall changes: https://github.com/rust-lang/rust/pull/136437 Part **4** of **7** of the *`compiletest`-related cleanups* PR series. ### Summary - Remove `--build-base` compiletest flag, and introduce `--build-{root,test-suite-root}` flags instead. `--build-base` previously actually is test suite specific build directory, not the root `build/` directory. - Feed the root build directory directly from bootstrap to compiletest via `--build-root` instead of doing multiple layers of parent unwrapping[^parent] based on the test suite specific build directory. - Remove a redundant `to_path_buf()`. [^parent]: Please do not unwrap the parents. r? bootstrap
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