Somehow it is not exported in C API.
Reviewed By: ftynse
Differential Revision: https://reviews.llvm.org/D105422
static inline bool mlirValueIsNull(MlirValue value) { return !value.ptr; }
/// Returns 1 if two values are equal, 0 otherwise.
-bool mlirValueEqual(MlirValue value1, MlirValue value2);
+MLIR_CAPI_EXPORTED bool mlirValueEqual(MlirValue value1, MlirValue value2);
/// Returns 1 if the value is a block argument, 0 otherwise.
MLIR_CAPI_EXPORTED bool mlirValueIsABlockArgument(MlirValue value);