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Extend debugging llvm section#1290

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JohnTitor merged 13 commits intorust-lang:masterrust-lang/rustc-dev-guide:masterfrom

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Apr 14, 2022

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Commits on Jan 25, 2022

• LLVM has moved its development and issue tracking to github, so fix that URL to point there.

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• Added some additional structure to the document by adding more headers.

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• I couldn't help myself: there's so much relevant stuff in my MCVE blog post that I had to include a link.

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• break paragraph into two parts; suggestion of using `opt` tool is orthogonal to

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• migrate details of varied LLVM IR generation into appropriate section on the matter.

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• Move the "Investigate LLVM optimization passes" section beneath

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• We don't need the part II distinction now that the sections are adjacent.

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Commits on Jan 26, 2022

• Some notes on the LLVM tools that are generated under `build/$TRIPLE/llvm/`.

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• An important note that I wish I had heeded when I was trying to dissect issue 91671.

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• Added notes on how to turn on and control LLVM debugging output.

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• Added a caveat about the effectiveness of the `-print` family of options to LLVM.

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• fix typo.

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• Address line length lints by, well, breaking lines.

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