buffer: runtime-deprecate Buffer(num) by default
This is a "light" version of #15346 that only prints the warning by default when [new ]Buffer(num)
is used, as suggested by @BridgeAR in https://github.com/nodejs/node/pull/15346#issuecomment-331557738.
Most reasons for runtime deprecation by default as listed in #15346 still apply here.
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
Affected core subsystem(s)
buffer