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

[Shankar Kalpathi Easwaran]

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

http://reviews.llvm.org/D7840

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