Chris Lattner 3f2530cdf5 Split "rewrite" functionality out of Pattern into a new RewritePattern derived ...

class.  This change is NFC, but allows for new kinds of patterns, specifically
LegalizationPatterns which will be allowed to change the types of things they
rewrite.

PiperOrigin-RevId: 223243783

2019-03-29 14:12:07 -07:00

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