[PATCH] Modify llvm-objdump to display information for common symbols similar to GNU objdump

[Rafael Ávila de Espíndola]

There are a few difference left, but this is going on the right direction.

LGTM


REPOSITORY
  rL LLVM

================
Comment at: test/tools/llvm-objdump/common-symbol-elf.test:4
@@ +3,1 @@
+CHECK: 00000400 g       *COM*  00000008 common_symbol
\ No newline at end of file

----------------
please add a newline.

http://reviews.llvm.org/D7147

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