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Jon Ross-Perkins
51b4abec20
This builds a mechanism for the toolchain to construct more complex
min_prelude files, which in turn should allow the toolchain to stop
special-casing the min_prelude directory. For example, instead of:
```
args.insert(args.end(), {"--custom-core",
"--exclude-dump-file-prefix=include_files/"});
```
This should allow (in a `min_prelude` file):
```
// EXTRA-ARGS: --custom-core --exclude-dump-file-prefix=include_files/
```
Then when that min_prelude is included, it'd be used.
But also, this should allow sharing between min_prelude files with use
of `INCLUDE-FILE`, which as we make progressively more complex
min_preludes might become useful.