[llvm] [NFC] Annotate CommentFlag with underlying type (PR #186560)

[Sam Elliott via llvm-commits]

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@@ -393,7 +393,7 @@ class MachineInstr
   void clearAsmPrinterFlags() { AsmPrinterFlags = 0; }
 
   /// Return whether an AsmPrinter flag is set.
-  bool getAsmPrinterFlag(CommentFlag Flag) const {
+  bool getAsmPrinterFlag(uint8_t Flag) const {
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lenary wrote:

Sounds good. I'll do that when I'm back at my desk in a few days :) 

(The same reason is why i didn't do an enum class fyi)

https://github.com/llvm/llvm-project/pull/186560