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Author SHA1 Message Date
Rafael Espindola d7a32ea4b8 Change how symbol sizes are handled in lib/Object. 
COFF and MachO only define symbol sizes for common symbols. Reflect that
in the class hierarchy by having a method for common symbols only in the base
and a general one in ELF.

This avoids the need of using a magic value for the size, which had a few
problems
* Most callers didn't check for it.
* The ones that did could not tell the magic value from a file actually having
  that value.

llvm-svn: 240529
 2015-06-24 10:20:30 +00:00
Rafael Espindola 49943652f5 Handle multiple symbols having the same address. 
I will add an explicit test in a second, but this fixes the bots.

llvm-svn: 240372
 2015-06-23 03:36:08 +00:00
Rafael Espindola b109c032bd Extract an utility for computing symbol sizes on MachO and COFF. 
I will add a second user in the next commit.

llvm-svn: 240366
 2015-06-23 02:08:48 +00:00