Update DT_RELA* fields when packing relocations with addends.

Update DT_RELA* fields when packing relocations with addends.

If the shared libary being packed uses relocations with addends,
update DT_RELASZ and DT_RELACOUNT instead of DT_RELSZ and DT_RELCOUNT.
Check DT_RELAENT instead of DT_RELENT.

Update unit test data to match.

BUG=385553
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=289950

[rmcilroy, 2014-08-15 16:28:48]

lgtm with an optional suggestions.

https://codereview.chromium.org/474283002/diff/1/tools/relocation_packer/src/...
File tools/relocation_packer/src/elf_file.cc (right):

https://codereview.chromium.org/474283002/diff/1/tools/relocation_packer/src/...
tools/relocation_packer/src/elf_file.cc:396: // Only one will be present. 
Adjust by hole size.
Should we assert that only one is present?

[simonb (inactive), 2014-08-15 16:32:19]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-08-15 16:35:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/simonb@chromium.org/474283002/1

[commit-bot: I haz the power, 2014-08-15 18:22:15]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_compile_dbg on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)

[commit-bot: I haz the power, 2014-08-15 18:40:21]

Committed patchset #1 (1) as 289950