src: remove redundant calls to HandleScope
Refs: https://github.com/nodejs/node/pull/19972#issuecomment-381353894 Refs: https://github.com/nodejs/node/pull/20045
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
cc @addaleax @hashseed @nodejs/v8