Lei Zhang 311af4abf3 Const fold splat vectors/tensors in standard add, sub, and mul ops
The const folding logic is structurally similar, so use a template
to abstract the common part.

Moved mul(x, 0) to a legalization pattern to be consistent with
mul(x, 1).

Also promoted getZeroAttr() to be a method on Builder since it is
expected to be frequently used.

PiperOrigin-RevId: 228891989
2019-03-29 15:09:55 -07:00
..
2019-03-29 12:41:43 -07:00