Fix asm printer for affine expr
Fix asm printer for affine expr

- fixes #201

Signed-off-by: Uday Bondhugula <uday@polymagelabs.com>

Closes #204

COPYBARA_INTEGRATE_REVIEW=https://github.com/tensorflow/mlir/pull/204 from bondhugula:printfix 3f8a5b65391f45598258b2735fecaa409fbde848
PiperOrigin-RevId: 279115720
Change-Id: Ib541a7638e68c5b6543ba9815477f468d8f4bbd9

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