unit tests crashing on x86_64 since r223394

[Sahasrabuddhe, Sameer]

Hi all,

Unit tests have been crashing with all my builds on an x86_64 machine 
running Ubuntu 14.04.1. A git bisect pointed at the following commit:

------------------------------------------------------------------------
r223394 | rafael | 2014-12-05 03:46:08 +0530 (Fri, 05 Dec 2014) | 1 line

Also use --icf=safe if we are being linked by gold.
------------------------------------------------------------------------

Reverting this commit allows trunk to build correctly with cmake + 
ninja. Without this fix, trunk shows the following on "ninja check":

   Expected Passes    : 6400
   Expected Failures  : 30
   Unsupported Tests  : 4719
   Unexpected Failures: 895

Sameer.
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