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worker: add public method for marking objects as untransferable

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/markAsUntransferable into master

We currently mark a number of ArrayBuffers as not transferable, including the Buffer pool and ones with finalizers provided by C++ addons.

There is no good reason to assume that userland code might not encounter similar problems, for example when doing ArrayBuffer pooling similar to ours. Therefore, provide an API that lets userland code also mark objects as not transferable.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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