Gold: Patch linker to implement --long-plt flag.

Gold: Patch linker to implement --long-plt flag.

Also modify script to extract binutils sources from tarball and apply
patches unconditionally to avoid problems with later runs if a patch
fails to apply.

Re-land of https://codereview.chromium.org/1537083003/ now that the
binutils binaries are uploaded to goma.

BUG=554017
R=thestig@chromium.org

Committed: https://crrev.com/37afebf7351a4918410829eac48f7125ed6fe3e3
Cr-Commit-Position: refs/heads/master@{#368648}

[Lei Zhang, 2016-01-11 19:20:34]

lgtm

[pcc1, 2016-01-11 19:21:06]

The CQ bit was checked by pcc@chromium.org

[commit-bot: I haz the power, 2016-01-11 19:22:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1580443002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1580443002/1

[commit-bot: I haz the power, 2016-01-11 20:10:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-11 20:12:51]

Description was changed from

==========
Gold: Patch linker to implement --long-plt flag.

Also modify script to extract binutils sources from tarball and apply
patches unconditionally to avoid problems with later runs if a patch
fails to apply.

Re-land of https://codereview.chromium.org/1537083003/ now that the
binutils binaries are uploaded to goma.

BUG=554017
R=thestig@chromium.org
==========

to

==========
Gold: Patch linker to implement --long-plt flag.

Also modify script to extract binutils sources from tarball and apply
patches unconditionally to avoid problems with later runs if a patch
fails to apply.

Re-land of https://codereview.chromium.org/1537083003/ now that the
binutils binaries are uploaded to goma.

BUG=554017
R=thestig@chromium.org

Committed: https://crrev.com/37afebf7351a4918410829eac48f7125ed6fe3e3
Cr-Commit-Position: refs/heads/master@{#368648}
==========

[commit-bot: I haz the power, 2016-01-11 20:12:52]

Patchset 1 (id:??) landed as
https://crrev.com/37afebf7351a4918410829eac48f7125ed6fe3e3
Cr-Commit-Position: refs/heads/master@{#368648}