[PATCH] regex construction from basic_string

[Jonathan Wakely]

This fixes basic_regex construction from a basic_string with
non-default char_traits and/or allocator.

        * include/tr1_impl/regex (basic_regex::basic_regex): Use range
        constructor for _M_pattern.
        * testsuite/tr1/7_regular_expressions/basic_regex/ctors/char/
        string.cc: Test construction from different basic_string type.
        * testsuite/tr1/7_regular_expressions/basic_regex/ctors/wchar_t/
        string.cc: Likewise.

tested x86_64 linux, OK to commit?

Jonathan
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