Lucy Fox 573ded613d Track usage of reference variables in TF graphs.
Adds a gauge to track usage of reference variables. This is checked on Graph import to MLIR; thus the gauge is only set if the MLIR-based bridge is enabled.

PiperOrigin-RevId: 338165779
Change-Id: Ic807b66e1b4678f3651e662547334fb6e654f463
2020-10-20 17:13:37 -07:00
..
2020-08-29 01:32:40 -07:00
2020-08-29 01:32:40 -07:00