[turbofan] Introduce builders for property access.

[turbofan] Introduce builders for property access.

This introduces a choke point in the AstGraphBuilder for property
access creation. This makes it easier to enrich all such nodes with
additional side-table or debugging information.

R=titzer@chromium.org

Committed: https://crrev.com/4dfff4abbd3a9513876c11b15aa27aacbb94fd3e
Cr-Commit-Position: refs/heads/master@{#27157}

[titzer, 2015-03-12 13:36:45]

lgtm

[Michael Starzinger, 2015-03-12 13:44:20]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-03-12 13:44:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1002713002/1

[commit-bot: I haz the power, 2015-03-12 13:49:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-12 13:50:13]

Patchset 1 (id:??) landed as
https://crrev.com/4dfff4abbd3a9513876c11b15aa27aacbb94fd3e
Cr-Commit-Position: refs/heads/master@{#27157}