move per-context changes from c++ to js
move the changes made to new contexts from c++ to js.
second commit adds a warning when Atomics.wake is used and changes Atomics.notify.name to notify
/cc @rwaldron
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines