Updating VarCheck for new logical assignment operators.
Updating VarCheck for new logical assignment operators.

PiperOrigin-RevId: 384282609

monetate/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,google/closure-compiler,ChadKillingsworth/closure-compiler,google/closure-compiler,monetate/closure-compiler,google/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,ChadKillingsworth/closure-compiler,google/closure-compiler