tools: port dust a source module minimizer

[saem]

Summary

Add a compiler error message minimizer executable to the compiler
distribution, called dust . Given a compiler error message,
dust $compiler_options $module_to_reduce will reduce said module's
code in place until a minimal module that generates the same error is
produced.

Details

dust is a new executable that ships with NimSkull, that minimizes a
module down to the smallest failing module. This is useful for those
submitting bugs, allowing for easy reduction in test cases size, or
those looking to reduce failing code to better understand it.

It can be run by calling dust <file_to_minimize.nim> , it will then
reduce the file to the minimal failing case. This is an inplace edit --
so be sure to save a copy if you want to keep the original.

In addition to the introduction of dust , a dedicated tester also
exists meant to facilitate testing of the tool, it's a simple driver for
the dust executable.

Porting Details

dust was originally written by @disruptek, this ported version has a
few key differences:

1. It works on NimSkull and ships with the compiler, ensuring we're
   always reducing with a like for like compiler
2. The search algorithm and AST mutators are much faster (greater than
   70x)
3. Includes a tester that can be run via CI

[zerbina]

I did a first pass and left some minor style suggestions.

[saem]

Dust now works and successfully reduces the broken code in mminimizeme.nim, it's a bit slow, but that's probably fixable as sem gets faster (removal of unnecessary wrapping etc).

Another thing that will likely help a fair bit is a breadth first search and early elimination of the search space, but I'm not sure how to implement that (besides the breadth first) just yet.

[github-actions]

Merge requested by: @saem

Contents after the first section break of the PR description has been removed and preserved below:

---

Notes for Reviewers

• create a proper PR message
• figure out some minor testing, at least try it
• audit dust code to use the latest in nimskull compiler
• remove warnings and hints
• undo the error wrap change as it leads to issues (e.g. unlimited template expansion)
• add dust as a release artifact
• merge all imports into a single section at the top of the file
• remove the spaces after and before / in import paths
• add a small doc comment at the top of each new module, detailing their purpose
• change the procedure-level doc comments to use third-person singular and to start with a capital letter and end with a period
• add relevant docs? (suggestions from others welcome)

[saem]

/merge

[saem]

/merge

[saem]

sigh... I'm guessing it didn't run the leak sanitizer locally when I did ran the tools tests via koch, oh well, I'll have to figure that out and see what to make of the errors.

[saem]

I presently can't get a local reproduction, so while I wait to hear back from others about how I might do that I took a stab in the dark and enabled --gc:orc for dust in case that's the issue, on the basis that the vmrunner requires it as well.

---

Reproduction steps I've tried:

• install liblsan (previously i got a linker failure until I installed it)
• compiled dust with all the flags from leak.yml
• ran koch.py testtools just like leak.yml
• result: I didn't get any failure spam
• my os is Fedora 43 workstation, if that helps

[saem]

/merge

[saem]

/merge