google-breakpad: fix a unittest failure with clang.

de-reference a null pointer is undefined behavior, for LLVM, we need to
add 'volatile' keyword to get a crash that we are looking for.

BUG=chromium:498354
TEST=CXX=x86_64-cros-linux-gnu-clang++  FEATURES='test'
     emerge-falco google-breakpad

Change-Id: I5a2f6fea410a0f109cf6f41ef66420bb4c60aacf
Reviewed-on: https://chromium-review.googlesource.com/286168
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
1 file changed