Commits on Jul 21, 2021

1. Update all submodules that rustbuild doesn't depend on lazily …

   This only updates the submodules the first time they're needed, instead
   of unconditionally the first time you run x.py.
   
   Ideally, this would move *all* submodules and not exclude some tools and
   backtrace. Unfortunately, cargo requires all `Cargo.toml` files in the
   whole workspace to be present to build any crate.
   
   On my machine, this takes the time for an initial submodule clone (for
   `x.py --help`) from 55.70 to 15.87 seconds.
   
   This uses exactly the same logic as the LLVM update used, modulo some
   minor cleanups:
   - Use a local variable for `src.join(relative_path)`
   - Remove unnecessary arrays for `book!` macro and make the macro simpler to use
   - Add more comments

   

   jyn514 committed Jul 21, 2021
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