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98b577be85
When demangling string literals, Microsoft's undname simply prints 'string'. This patch implements string literal demangling while doing a bit better than this by decoding as much of the string as possible and trying to faithfully reproduce the original string literal definition. This is a bit tricky because the different character types char, char16_t, and char32_t are not uniquely identified by the mangling, so we have to use a heuristic to try to guess the character type. But it works pretty well, and many tests are added to illustrate the behavior. Differential Revision: https://reviews.llvm.org/D50806 llvm-svn: 339892