Add a assert for running a sanitizer in debug.

Add a assert for running a sanitizer in debug.

I found that msan doesn't link in debug builds. It fails linking with an
obscure error. To prevent other people from having this problem, this patch
adds an assert for this case.

Committed: https://crrev.com/1131f71c0604dfbe6e1f2d3ef6dcb8d288c7e4f6
Cr-Commit-Position: refs/heads/master@{#346764}

[brettw, 2015-09-01 21:50:19]

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

[brettw, 2015-09-01 21:50:22]

The CQ bit was checked by brettw@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-01 21:51:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1326453003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1326453003/20001

[Nico, 2015-09-01 21:59:45]

lgtm!

https://codereview.chromium.org/1326453003/diff/20001/build/config/sanitizers...
File build/config/sanitizers/sanitizers.gni (right):

https://codereview.chromium.org/1326453003/diff/20001/build/config/sanitizers...
build/config/sanitizers/sanitizers.gni:29: # links, one would normally never run
a sanitizer in release mode. Running in
"never run a sanitizer in _debug_ mode", right?

[brettw, 2015-09-01 22:03:59]

Good catch, thanks.

[brettw, 2015-09-01 22:04:02]

The CQ bit was checked by brettw@chromium.org

[brettw, 2015-09-01 22:04:02]

The patchset sent to the CQ was uploaded after l-g-t-m from thakis@chromium.org
Link to the patchset: https://codereview.chromium.org/1326453003/#ps40001
(title: " ")

[commit-bot: I haz the power, 2015-09-01 22:04:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1326453003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1326453003/40001

[commit-bot: I haz the power, 2015-09-01 22:51:48]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-09-01 22:52:23]

Patchset 3 (id:??) landed as
https://crrev.com/1131f71c0604dfbe6e1f2d3ef6dcb8d288c7e4f6
Cr-Commit-Position: refs/heads/master@{#346764}