[PATCH] [ELF] Create reference to symbol map.

[Rui Ueyama]

I'm still reading the prior patches but this patch itself looks good.


================
Comment at: lib/ReaderWriter/ELF/ELFFile.h:399
@@ +398,3 @@
+      return elfReferenceToSymbol->second;
+    ;
+    return nullptr;
----------------
shankarke wrote:
> this is a minor nit and will fix.
Remove

http://reviews.llvm.org/D7840

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