benchmark: remove misc/v8-bench.js
These v8 benchmarks are oudated and have been replaced by Octane in the upstream. The benchmarking working group has already been benchmarking Octane, so this file can be removed now.
Refs: https://github.com/nodejs/node/issues/16119
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
benchmark