[PATCH] D95578: [Docs] Update HowToSubmitABug

[Arthur Eubanks via Phabricator via llvm-commits]

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With the new PM imminent, bugpoint will diverge from opt, meaning it may
not reproduce a crash with the same arguments passed to opt. We need to
specify alternatives to bugpoint for reducing crashes.

I looked at the rest of the document to see if anything could be
improved. Major highlights:

- Run -Xclang -disable-llvm-passes instead of -O0 for skipping IR passes
- Mention the files that clang dumps on a crash
- Remove outdated reference to `delta` and plug `creduce` instead
- Mention llvm-reduce on top of bugpoint
- Mention --print-before-all --print-module-scope
- Mention sanitizers in addition to valgrind
- Mention opt-bisect for miscompiles


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95578

Files:
  llvm/docs/HowToSubmitABug.rst

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