[PATCH] [Object/ELF] Provide symbol helpers

[Rafael Ávila de Espíndola]

LGTM with a fix for common symbols.


================
Comment at: include/llvm/Object/ELFTypes.h:185
@@ +184,3 @@
+  }
+  bool isDefined() const {
+    return !isUndefinedSymbol() &&
----------------
Now that I think of it, do we count common as defined? For ELF probably.

With that you can use

!isUndefiredSymbol && !(st_shndx >= SHN_LORESERVE && st_shndx < SHN_ABS);

http://reviews.llvm.org/D10264

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