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This is part of https://discourse.llvm.org/t/rfc-introduce-opasm-type-attr-interface-for-pretty-print-in-asmprinter/83792. Verbose printing of commonly used type/attribute that is long could severely reduce the readablity of the resulting assembly, and it has been asked several times in the LLVM discourse how to generate alias. Cc @ftynse ### Discussion * I am not sure where to put the markdown, so I put it in `mlir/docs/`. * Documentation on `OpAsmOpInterface` (controlling `AsmResultName`/`BlockArgName`/etc) could also be added in this markdown, so I used the title `Customizing AsmPrinter Behavior` and let further PR to update the content.