Those were wrongly translated from gyp with ia32. This should
land before renaming v8_target_arch to v8_target_cpu.

BUG=chromium:620527
NOTRY=true
TBR=vogelheim@chromium.org

Review-Url: https://codereview.chromium.org/2065323004
Cr-Commit-Position: refs/heads/master@{#37027}