Saleem Abdulrasool 2550fd9efb Demangle: replace custom typedef for std::string with std::string
We created a local typedef for `std::basic_string<char, std::char_traits<char>>`
which is just `std::string`.  Remove the local typedef and propagate the type
information through the rest of the demangler.  NFC.

llvm-svn: 287470
2016-11-20 00:20:23 +00:00
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