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

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@@ -213,6 +213,22 @@ def fir_IntegerType : FIR_Type<"Integer", "int"> {
   }];
 }
 
+def fir_UnsignedType : FIR_Type<"Unsigned", "unsigned"> {
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jeanPerier wrote:

Removing both the type and predicate, I got no failures (I had to help make by deleting some of the tablegen generated `.cpp.inc` that still referred to the type though, but fresh build should not hit that issue). I am however OK with adding this type for consistency with fir_IntegerType.

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