nacl_helper: Removing ldflags which intended to fix crash in ThinLTO

This patch will remove a linker flag for ThinLTO. The flag was first
introduced to work around a nacl crash bug. After the compiler upgrade,
there is no need to keep this work around.

I tested the nacl_helper code size changes on several different boards:
on samus: 30MB -> 11MB
on elm: 19MB -> 7MB
on veyton-minnie: 19MB -> 7MB

Tested correctness by trying to reproduce https://crbug.com/799642 and
no error shows up.

BUG=chromium:799642
TEST=USE="afdo_use" emerge-samus chromeos-chrome

Change-Id: I6fff65700e6d5a5d0e02ad810def5317ea912263
Reviewed-on: https://chromium-review.googlesource.com/c/1277596
Reviewed-by: Mark Seaborn <mseaborn@chromium.org>
Commit-Queue: Zhizhou Yang <zhizhouy@google.com>
Cr-Commit-Position: refs/heads/master@{#599071}
1 file changed