Jacob Pratt
780e699707
bootstrap: Don't clone submodules unconditionally in dry-run This made it very annoying to debug bootstrap itself, because every `--dry-run` invocation would start out by cloning LLVM, which is almost never necessary. Instead change a few Steps to properly support dry_run when no submodule is checked out. I tested this by running all of `check`, `build`, `doc`, `dist`, `install`, `vendor`, `clippy`, `fix`, and `miri` with `--dry-run`.
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