[PATCH] [lld][core] sectionGroup support.

[Simon Atanasyan]

  There is a couple of new test inputs but I do not see any new or modified tests.


================
Comment at: lib/Core/SymbolTable.cpp:193
@@ +192,3 @@
+      findSignature(*existingMember, visitedSet);
+  assert((signatureAtom == *groupSignature) &&
+         "Signature for group and the existing signature point to different "
----------------
I get the following compiler error on this line:

   SymbolTable.cpp:193:25: error: invalid operands to binary expression ('const lld::DefinedAtom' and 'const lld::DefinedAtom')


http://llvm-reviews.chandlerc.com/D2710