The (k=k) can results in "multiple unsequenced modifications to 'kind'"
warning when this macro is expanded twice in the same expression.

--HG--
extra : amend_source : 6a5e7668208a89296264b05bbfe7640514318a1d

remove duplication of type analysis for base type tuple of Python classes (could crash the compiler for non-trivial base class expressions)

implement another try-finally corner case (the Py3 way only for now!): reraising a fresh exception in the finally clause

optimise string-to-something comparisons also when we know that the result is boolean (the cmp functions have a proper fallback for non-strings)

revert dynamic tp_new() override because it breaks instantiating types with arguments that object.__new__()/object.__init__() don't expect

reuse object's tp_new() for simple extension types if possible to improve support for multiple inheritance