[clang] [clang] Support --sysroot= for ${arch}-windows-msvc targets (PR #96417)

[via cfe-commits]

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@@ -1290,6 +1296,9 @@ void ToolChain::AddCXXStdlibLibArgs(const ArgList &Args,
   case ToolChain::CST_Libstdcxx:
     CmdArgs.push_back("-lstdc++");
     break;
+
+  default:
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zmodem wrote:

Let's spell out the CST_Stl case explicitly and avoid a default case. That way -Wswitch-enum will fire in the future if a new enum gets added.

https://github.com/llvm/llvm-project/pull/96417