Only use ASAN container_overflow on 64-bit Linux.
Only use ASAN container_overflow on 64-bit Linux.

This apparently causes crashes on the Chromium OS (x86) Asan
builder.

BUG=461406
TBR=tkent@chromium.org

Review URL: https://codereview.chromium.org/968663005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@191140 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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