Uday Bondhugula 3dc4fb6f0f Parsing support for affine maps and affine expressions
A recursive descent parser for affine maps/expressions with operator precedence and
associativity. (While on this, sketch out uniqui'ing functionality for affine maps
and affine binary op expressions (partly).)

PiperOrigin-RevId: 203222063
2019-03-29 12:28:22 -07:00
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