[issue2260] conditional jump to a POP_TOP optimization

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Adding a simpler approach.  It's a bit limited because some common cases
have the POP_TOP JUMP_FORWARD 1 pair split across two basic blocks. 
Those cases should not be optimized away on a first pass.

Added file: http://bugs.python.org/file12020/pop_peep.diff

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