[mlir][LangRef] Add top-level production to the MLIR grammar
The LangRef currently lacks a top-level production, leaving the productions attribute-alias-def and type-alias-defunused. Clarify the situation by declaring what is to be parsed by an MLIR parser at the toplevel. Reviewed By: mehdi_amini Differential Revision: https://reviews.llvm.org/D117668
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