[clang] [Clang][Driver] Revise Cygwin ToolChain to call linker directly (PR #147960)

[Tomohiro Kashiwada via cfe-commits]

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kikairoya wrote:

Does it need to check that `--disable-high-entropy-va` isn't emitted when targeting i686?

https://github.com/llvm/llvm-project/pull/147960