n-api: cache Symbol.hasInstance
This improves the performance of napi_instanceof() by retrieving Symbol.hasInstance from the global object once and then storing a persistent reference to it in the env.
Re https://github.com/nodejs/abi-stable-node/issues/209 Re https://github.com/nodejs/abi-stable-node/pull/214
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
N-API