[clang] [Clang] [Driver] add a Cygwin ToolChain (PR #135691)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- clang/lib/Driver/ToolChains/Cygwin.cpp clang/lib/Driver/ToolChains/Cygwin.h clang/lib/Driver/Driver.cpp clang/lib/Driver/ToolChains/Gnu.cpp clang/lib/Lex/InitHeaderSearch.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/Cygwin.cpp b/clang/lib/Driver/ToolChains/Cygwin.cpp
index 57a8815f9..62ac12923 100644
--- a/clang/lib/Driver/ToolChains/Cygwin.cpp
+++ b/clang/lib/Driver/ToolChains/Cygwin.cpp
@@ -47,7 +47,7 @@ Cygwin::Cygwin(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
 }
 
 void Cygwin::AddClangSystemIncludeArgs(const ArgList &DriverArgs,
-                                     ArgStringList &CC1Args) const {
+                                       ArgStringList &CC1Args) const {
   const Driver &D = getDriver();
   std::string SysRoot = computeSysRoot();
 

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https://github.com/llvm/llvm-project/pull/135691