[clang] [flang] [flang] Add UNSIGNED (PR #113504)

[Peter Klausler via cfe-commits]

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@@ -400,6 +400,69 @@ constexpr TypeBuilderFunc getModel<bool &>() {
     return fir::ReferenceType::get(f(context));
   };
 }
+template <>
+constexpr TypeBuilderFunc getModel<unsigned short>() {
+  return getModel<short>();
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klausler wrote:

The existing code does not distinguish `unsigned int` from `signed int`, so I followed that precedent for other sizes of `unsigned` types.  Should the patch be changed to mark the signature for `unsigned int` as being unsigned, along with the other sizes, or just the other sizes?

https://github.com/llvm/llvm-project/pull/113504