[clang] [MS ABI]: Support preserve_none in MS ABI (PR #96487)

[via cfe-commits]

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@@ -2986,6 +2989,9 @@ void MicrosoftCXXNameMangler::mangleCallingConvention(CallingConv CC) {
     case CC_Swift: Out << 'S'; break;
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antangelo wrote:

Done

https://github.com/llvm/llvm-project/pull/96487