Clang update script: use the just-built Clang for building compiler-rt

Clang update script: use the just-built Clang for building compiler-rt

After r248853, compiler-rt has problems building with the 10.10 SDK.
Building with the just-built Clang should fix it.

BUG=539600
TBR=thakis

Committed: https://chromium.googlesource.com/chromium/src/+/b1324580f07ea08651002a05c7dc0471e53083db

[hans, 2015-10-05 23:25:03]

hans@chromium.org changed reviewers:
+ thakis@chromium.org

[hans, 2015-10-05 23:25:03]

This should hopefully fix the MacToT builders. They might need a manual
clobbering of the compiler_rt build dir to switch compilers.

[hans, 2015-10-05 23:25:19]

The CQ bit was checked by hans@chromium.org

[commit-bot: I haz the power, 2015-10-05 23:26:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375193005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375193005/1

[commit-bot: I haz the power, 2015-10-05 23:30:13]

Patchset 1 (id:??) landed as
https://crrev.com/b1324580f07ea08651002a05c7dc0471e53083db
Cr-Commit-Position: refs/heads/master@{#352461}

[hans, 2015-10-05 23:30:33]

Committed patchset #1 (id:1) manually as
b1324580f07ea08651002a05c7dc0471e53083db (presubmit successful).

[Nico, 2015-10-08 19:49:09]

lgtm

Did you inform cbieneman that his change means that compiler-rt can't be built
with Xcode's clang atm? Not sure if that's intentional. But for us, this is
fine, thanks.

[hans, 2015-10-08 20:54:29]

On 2015/10/08 19:49:09, Nico (offline until Fri Oct 9) wrote:
> Did you inform cbieneman that his change means that compiler-rt can't be built
> with Xcode's clang atm? Not sure if that's intentional. But for us, this is
> fine, thanks.

Yup. The reply was basically use a newer Clang.
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151005/303674.html