[clang] [clang] Add deprecation warning for `-Ofast` driver option (PR #98736)

[Vlad Serebrennikov via cfe-commits]

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@@ -470,6 +470,9 @@ New Compiler Flags
 Deprecated Compiler Flags
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+- ``-Ofast`` is deprecated in favor of ``-O3``, possibly combined with ``-ffast-math``.
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Endilll wrote:

Fixed. Thank you!

https://github.com/llvm/llvm-project/pull/98736