libstdc++/4960: std::string slow to append individual characters

[paolo@gcc.gnu.org]

Synopsis: std::string slow to append individual characters

State-Changed-From-To: analyzed->feedback
State-Changed-By: paolo
State-Changed-When: Wed Dec  5 00:40:47 2001
State-Changed-Why:
    Fetch a current 3.1 snapshot and benchmark again. You
    should notice a definite improvement.
    However, the final solution to the problem is an
    exponential growth policy. Patch for this posted in:
    http://gcc.gnu.org/ml/libstdc++/2001-12/msg00007.html
    Can you try it?

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