[issue24325] Speedup types.coroutine()

[Nick Coghlan]

Nick Coghlan added the comment:

+1 from me for merging this for 3.5.0 and deferring issue 24468 (which now proposes making _opcode a builtin module to allow compiler constants to be easily shared between C code and Python code) to 3.6 instead.

The design changes to address issue 24400 cleaned up various aspect of both the internal architecture and the public data model of PEP 492, and the latest draft of this patch benefits accordingly.

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