[clang] [llvm] [NFC][win] Use an enum for the cfguard module flag (PR #176461)

[Daniel Paoliello via cfe-commits]

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@@ -665,7 +665,7 @@ bool AsmPrinter::doInitialization(Module &M) {
     Handlers.push_back(std::unique_ptr<EHStreamer>(ES));
 
   // Emit tables for any value of cfguard flag (i.e. cfguard=1 or cfguard=2).
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dpaoliello wrote:

Updated to match the code.

https://github.com/llvm/llvm-project/pull/176461