Armin Rigo committed 0886def

Fix whatsnew

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File pypy/doc/whatsnew-head.rst

 Added support for ``__getitem__``, ``__setitem__``, ``__getslice__``,
 ``__setslice__``,  and ``__len__`` to RPython
+.. branch: stringbuilder2-perf
+Give the StringBuilder a more flexible internal structure, with a
+chained list of strings instead of just one string. This make it
+more efficient when building large strings, e.g. with cStringIO().
+Also, use systematically jit.conditional_call() instead of regular
+branches. This lets the JIT make more linear code, at the cost of
+forcing a bit more data (to be passed as arguments to
+conditional_calls). I would expect the net result to be a slight
+slow-down on some simple benchmarks and a speed-up on bigger