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

[Daniel Chen via cfe-commits]

================
@@ -178,7 +192,12 @@ static constexpr TypePattern SameType{AnyType, KindCode::same};
 // universal extension feature.
 static constexpr TypePattern OperandReal{RealType, KindCode::operand};
 static constexpr TypePattern OperandInt{IntType, KindCode::operand};
+static constexpr TypePattern OperandUnsigned{UnsignedType, KindCode::operand};
+static constexpr TypePattern OperandIntOrUnsigned{
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DanielCChen wrote:

Same error here as well
```
llvm-project/flang/lib/Evaluate/intrinsics.cpp:196:30: error: unused variable 'OperandIntOrUnsigned' [-Werror,-Wunused-const-variable]
static constexpr TypePattern OperandIntOrUnsigned{
                             ^
```

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