[llvm] [RemoveDIs] Print non-intrinsic debug info in textual IR output (PR #79281)

[Stephen Tozer via llvm-commits]

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+;; Test that we can write in the new debug info format.
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SLTozer wrote:

There is a whitespace check in the test as written, the `{{^}}` at the start basically causes us to match leading whitespace. `--strict-whitespace` won't match leading whitespace unless you also pass `--match-full-lines`, and it's easier if we don't pass that since we don't have to match on the contents of the instructions.

https://github.com/llvm/llvm-project/pull/79281