[turbofan] Use proper parameter representation for stub calls.

[turbofan] Use proper parameter representation for stub calls.

The CallInterfaceDescriptor already provides information about the
expected representation of parameters, so we can use that instead of
hardcoding tagged representation for all parameters.

R=jarin@chromium.org

Committed: https://crrev.com/fb966fd666e8958717828e6b2bc9411808211bc7
Cr-Commit-Position: refs/heads/master@{#27308}

[Benedikt Meurer, 2015-03-19 13:06:43]

PTAL

[Jarin, 2015-03-19 13:09:24]

lgtm

[Benedikt Meurer, 2015-03-19 13:09:33]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-03-19 13:09:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1019293002/1

[commit-bot: I haz the power, 2015-03-19 13:58:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-19 13:58:36]

Patchset 1 (id:??) landed as
https://crrev.com/fb966fd666e8958717828e6b2bc9411808211bc7
Cr-Commit-Position: refs/heads/master@{#27308}