Synchronize Android relocation packer source with AOSP.

Synchronize Android relocation packer source with AOSP.

Imports:

- https://android-review.googlesource.com/#/c/147620/
    Exit normally when packing relocs saves no space

- https://android-review.googlesource.com/#/c/147745/
    Always use signed leb128 encoding

- https://android-review.googlesource.com/#/c/148073/
    Adjust DT_VERSYM/VERNEED/VERDEF dynamic sections

BUG=385553
Committed: https://crrev.com/0be8ee5f43abf673de164bec5b52fecbdcee00bf
Cr-Commit-Position: refs/heads/master@{#326836}

[simonb (inactive), 2015-04-24 16:34:58]

simonb@chromium.org changed reviewers:
+ rmcilroy@chromium.org, simonb@chromium.org

[rmcilroy, 2015-04-24 17:11:27]

On 2015/04/24 16:34:58, simonb wrote:

RSLGTM

[rmcilroy, 2015-04-24 17:11:43]

On 2015/04/24 17:11:27, rmcilroy wrote:
> On 2015/04/24 16:34:58, simonb wrote:
> 
> RSLGTM

let's try that again. Rubber-stamp LGTM

[simonb (inactive), 2015-04-24 17:42:42]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2015-04-24 17:42:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1099343004/1

[commit-bot: I haz the power, 2015-04-24 18:06:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-24 18:07:47]

Patchset 1 (id:??) landed as
https://crrev.com/0be8ee5f43abf673de164bec5b52fecbdcee00bf
Cr-Commit-Position: refs/heads/master@{#326836}