src: use enum for refed flag on native immediates
Refs: https://github.com/nodejs/node/pull/33320#discussion_r423141443
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Refs: https://github.com/nodejs/node/pull/33320#discussion_r423141443
make -j4 test (UNIX), or vcbuild test (Windows) passes