[issue17611] Move unwinding of stack for "pseudo exceptions" from interpreter to compiler.

[Antoine Pitrou]

Antoine Pitrou added the comment:

For example we could generate the following bytecode:

    SETUP_FINALLY L1
    // ... stmt1
    POP_BLOCK
    JUMP_FINALLY  L1
L1:
    // ... stmt2
    RERAISE
    JUMP_FORWARD  L2
L2:


JUMP_FINALLY would push 3 Nones on the stack.  RERAISE would raise only if 
non-None values are popped.

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<http://bugs.python.org/issue17611>
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