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[mlir][TypeDefGen] Remove the need to define parser/printer for singleton types

Authored by rriddle on Jan 6 2021, 2:54 PM.

Description

[mlir][TypeDefGen] Remove the need to define parser/printer for singleton types

This allows for singleton types without an explicit parser/printer to simply use
the mnemonic as the assembly format, removing the need for these types to provide the parser/printer
fields.

Differential Revision: https://reviews.llvm.org/D94194