Blocked revisions 65814 via svnmerge

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  r65814 | eric.smith | 2008-08-18 10:27:38 -0400 (Mon, 18 Aug 2008) | 12 lines

  Backport of r63826.

  Optimization of str.format() for cases with str, unicode, int, long,
  and float arguments.  This gives about 30% speed improvement for the
  simplest (but most common) cases.  This patch skips the __format__
  dispatch, and also avoids creating an object to hold the format_spec.

  Unfortunately there's a complication in 2.6 with int, long, and float
  because they always expect str format_specs.  So in the unicode
  version of this optimization, just check for unicode objects.  int,
  float, long, and str can be added later, if needed.
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