[llvm-commits] [patch] Implement a pass to instrument function entry and exit

[Nelson Elhage]

This patch adds a pass that adds calls to instrument function exit and
entry, in a way compatible with GCC's -finstrument-functions flag.

Options are also provided to selectively exclude certain functions from
instrumenting, analogous to those provided by GCC.

If this patch is not totally off-base, I'm planning to also implement
and send along a function attribute to disable instrumenting on specific
functions, and frontend support in clang.

- Nelson Elhage

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