[issue28410] Add convenient C API for "raise ... from ..."

[Roundup Robot]

Roundup Robot added the comment:

New changeset 969c8bfe8872 by Serhiy Storchaka in branch '3.6':
Issue #28410: Added _PyErr_FormatFromCause() -- the helper for raising
https://hg.python.org/cpython/rev/969c8bfe8872

New changeset 2119cb0beace by Serhiy Storchaka in branch 'default':
Issue #28410: Added _PyErr_FormatFromCause() -- the helper for raising
https://hg.python.org/cpython/rev/2119cb0beace

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