Alex Rickabaugh 5b9c96b9b8 refactor(ivy): change ImportMode enum to ImportFlags (#34649)
Previously, `ReferenceEmitter.emit()` took an `ImportMode` enum value, where
one value of the enum allowed forcing new imports to be generated when
emitting a reference to some value or type.

This commit refactors `ImportMode` to be an `ImportFlags` value instead.
Using a bit field of flags will allow future customization of reference
emitting.

PR Close #34649
2020-01-23 10:31:47 -08:00
..