River Riddle 7669a259c4 Add a simple common sub expression elimination pass. ...

The algorithm collects defining operations within a scoped hash table. The scopes within the hash table correspond to nodes within the dominance tree for a function. This cl only adds support for simple operations, i.e non side-effecting. Such operations, e.g. load/store/call, will be handled in later patches.

PiperOrigin-RevId: 223811328

2019-03-29 14:14:28 -07:00

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