inspect: fix pop undefined when array prototype pop deleted
If one explicitly deletes the array prototype in the repl instance then
the method to check for pop
seen in the context starts giving error.
Reason being primordials is not used and userland has modified the
prototype.
Fixed by using array pop method primordial.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines