[mlir] Set intial value for integer FieldParser function

[hcindyl]

Summary

GCC complains FieldParser returns the value that does not have an obvious initial value. Set an initial return value for the FieldParser function.

The change is a no-op functionality-wise. The return value should be updated within the function.

This should fix https://github.com/llvm/llvm-project/issues/64312

mlir/include/mlir/IR/DialectImplementation.h

struct FieldParser<
   }
 };
 
 /// Parse any integer.
 template <typename IntT>
 struct FieldParser<IntT,
                    std::enable_if_t<std::is_integral<IntT>::value, IntT>> {
   static FailureOr<IntT> parse(AsmParser &parser) {
-    IntT value;
+    IntT value = 0;
     if (parser.parseInteger(value))
       return failure();
     return value;
   }
 };
 
 /// Parse a string.
 template <>