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src, test: node internals' postmortem metadata

Rodrigo Muino Tomonari requested to merge github/fork/mmarchini/debugging_symbols into master

Those changes are the first steps towards allowing debug tools to navigate some of Node's internals strucutres, giving more possibilities to developers doing post-mortem debugging. One example of what can be achieved with the symbols added is a new command being developed for llnode, which prints information about handles and requests on the queue for a core dump file.

Ref: https://github.com/nodejs/post-mortem/issues/46

Obs.: To add good tests for those changes, something like nodejs/build#777 is needed.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines
Affected core subsystem(s)
  • Building system
  • Tools

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