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Chandler Carruth
e545929386
When building in Bazel actions, notably building runtimes, using absolute paths makes the results non-hermetic and generally less cache-friendly. This restructures the code to only form an absolute path as part of the `bazel run` change of working directory. It also tries to make the API for doing this a bit more clear by taking the `exe_path` and transforming it internally. To support this, this PR also generalizes the `RemovingDir` to support relative paths. While these can be tricky -- the working directory needs to not change while they exist -- that isn't a reason to fully exclude them and they're useful for implementing relative-path runtimes, etc.