GitLab

Currently v8_target_cpu can only be set to one particular architecture,
and that won't work for monochrome/webview builds where we need
to be able to build two different snapshots for two different architectures.

The way things are set are also confusing for when you need to do builds
for a target_cpu that is different from the host_cpu and the value of the
v8_target_cpu might get out of sync between target and host.

This change changes all that by making the cpu that v8 targets
a function of the current toolchain (thus declaring a v8_current_cpu
and using that instead).

R=brettw@chromium.org, jochen@chromium.org, michaelbai@chromium.org

BUG=625353

Review-Url: https://codereview.chromium.org/2116183002
Cr-Commit-Position: refs/heads/master@{#405551}