[libstdc++ PATCH] fix basic_string::replace for integral types

[Doug Gregor]

The implementation of basic_string::replace with this signature:

   template<class InputIterator>
     basic_string& replace(iterator i1, iterator i2, InputIterator j1, 
InputIterator j2);

does not dispatch appropriately when InputIterator is an integral type. 
This patch adds an _Is_integer check to handle the case properly. 
Tested on mainline, powerpc-apple-darwin6.6; no regressions, and the 
new test passes.

	Doug

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