[clang] [Clang][Sema] Fix type of enumerators in incomplete enumerations (PR #84068)

[Aaron Ballman via cfe-commits]

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@@ -6,7 +6,9 @@ typedef enum EnumA {
 } EnumA;
 
 enum EnumB {
-  B
+  B,
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AaronBallman wrote:

It might be good to capture some of what I wrote in the review summary as a comment here so it's clear why this is correct in both C and C++.

https://github.com/llvm/llvm-project/pull/84068