libstdc++: Import MSVC floating-point std::to_chars testcases
The testcases are imported almost verbatim, with the only change being to the -double_nan and -float_nan testcases. We expect these values to be formatted as "-nan" instead of "-nan(ind)". libstdc++-v3/ChangeLog: * testsuite/20_util/to_chars/double.cc: New test, consisting of testcases imported from the MSVC STL testsuite. * testsuite/20_util/to_chars/float.cc: Likewise.
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