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Add information about size for building the Rust Compiler 

The Rust codebase is large, not to mention the submodules. It would be helpful for some to have a warning or note about storage required before they spend possible hours to build, only to get a message in some form that they are running out/already out of storage. I did a stage1 build incrementally and it produced a build directory of about 14 gigabytes.
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ThePuzzlemaker 2020-06-10 21:43:01 -05:00 committed by Who? Me?!
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src/building/how-to-build-and-run.md
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@ -118,6 +118,9 @@ process described above, producing a usable compiler toolchain from the source
code you have checked out. This takes a long time, so it is not usually what
you want to actually run (more on this later).
Note that building will require a relatively large amount of storage space.
You may want to have upwards of 10 or 15 gigabytes available to build the compiler.
There are many flags you can pass to the build command of `x.py` that can be
beneficial to cutting down compile times or fitting other things you might
need to change. They are: