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[mlir] Add plus, star and optional less/greater parsing

Authored by Kayjukh on Nov 11 2020, 9:01 AM.

Description

[mlir] Add plus, star and optional less/greater parsing

The tokens are already handled by the lexer. This revision exposes them
through the parser interface.

This revision also adds missing functions for question mark parsing and
completes the list of valid punctuation tokens in the documentation.

Differential Revision: https://reviews.llvm.org/D90907