[PATCH] [ELF] Use llvm ADT's instead of std.

[Reid Kleckner]

Rui mentioned that he had to change a DenseMap to a std::map / unordered_map to fix a crasher when linking Chrome. Unfortunately, I don't think he ever figured exactly what was wrong with the LLVM container.

Unfortunately, the Chrome link is currently broken, or I would tell you to watch the bot when you commit:
http://build.chromium.org/p/chromium.fyi/builders/CrWinClangLLD


http://reviews.llvm.org/D7885

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