[mlir] Remove the memory space attribute restriction on memref types (#222995) Follow-up to #187682. `isSupportedMemorySpace` only rejected builtin attributes other than IntegerAttr/StringAttr/DictionaryAttr. This is a leftover from when memory spaces were restricted to integers, and is now inconsistent. GitOrigin-RevId: 4388400c3d0a95b75a36f81c7edd2eb95c6d63ea
See https://mlir.llvm.org/ for more information.