* add support for logical assignments with private properties
Patches the logic for handling assignment operators and adds support for
handling the logical assignment operators appropriately.
Fixes: https://github.com/babel/babel/issues/11646
* replace hardcoded logical assignment operators with constant
Replace a hardcoded check for logical assignment operators with the
LOGICAL_OPERATORS constant in
plugin-proposal-logical-assignment-operators.
Refs: https://github.com/babel/babel/pull/11702#discussion_r438554423
