[clang] [clang][NFC] Annotate `Type` bit-fields with `clang::preferred_type` (PR #70349)

[Vlad Serebrennikov via cfe-commits]

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@@ -20,7 +20,7 @@ namespace clang {
 
 /// Describes the different kinds of linkage
 /// (C++ [basic.link], C99 6.2.2) that an entity may have.
-enum Linkage : unsigned char {
+enum Linkage : unsigned {
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Endilll wrote:

This case is similar to `TypeDependence` we discuss in another thread, except that I can't find references to this type in data member declaration in our headers, which suggests that bit-field it stored in has hard-coded width, and has nothing to do with underlying type declared here.

https://github.com/llvm/llvm-project/pull/70349