[Clang] [Driver] add a Cygwin ToolChain#135691

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jeremyd2019 wants to merge 2 commits intollvm:mainfrom

jeremyd2019:clang-add-cygwin-driver

Commits on Apr 16, 2025

[Clang] [Driver] add a Cygwin ToolChain
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Commits on Apr 23, 2025

[Clang][Driver] add test for new Cygwin driver
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