Subzero: Enable "pnacl-translate -arch x86-64 --use-sz".
Subzero: Enable "pnacl-translate -arch x86-64 --use-sz".

Simply adds the x86-64 arch to the Subzero whitelist.

This is a prerequisite for full Subzero x86-64 support on the bots - CL in progress at https://codereview.chromium.org/1698523003/ .

BUG= https://bugs.chromium.org/p/nativeclient/issues/detail?id=4077
R=dschuff@chromium.org

Review URL: https://codereview.chromium.org/1695893002 .

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client