[PATCH] D61269: [CommandLine] Change help output to prefix long options with `--` instead of `-`. NFC

[Don Hinton via Phabricator via llvm-commits]

hintonda created this revision.
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By default, `parseCommandLineOptions()` will accept either a
`-` or `--` prefix for long options -- options with names longer than
a single character.

While this change does not affect behavior, it will be helpful with a
subsequent change that requires long options use the `--` prefix.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D61269

Files:
  llvm/lib/Support/CommandLine.cpp

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