(1.0.2-pre) string template instantiation problem on Win32

[Mumit Khan]

After Jason reverted the changes to libstd libstdc++/std/bastring.h and 
libstdc++/sinst.cc, I've been getting the following symbols undefined
on i386-cygwin32 and other Win32 variants when running the testsuite.

tstring.cc test:

=========================================
`basic_string<char, string_char_traits<char>, __default_alloc_template<false, 0> >::check_realloc(unsigned int) const'
`create__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepUi'
`copy__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepUiPCcUi'
`copy__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepUiPCcUi'
`move__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepUiPCcUi'
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv'
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv'
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv'
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv'
`_length_error(char const *)':
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv'
`__dl__Q2t12basic_string3ZcZt18string_char_traits1ZcZt24__default_alloc_template2b0i03RepPv' follow

=========================================

I've seen others reporting something similar here as well, but on some
other platform. The only solution I've found is to put back Jason's 
initial change and now everybody is happy, just that my object files are
now quite bloated waiting for the linker to discard duplicates.
 
Mumit