[turbofan] Lower monomorphic loads during graph building.

[turbofan] Lower monomorphic loads during graph building.

BUG=v8:6357

[Jarin, 2017-06-19 11:52:30]

jarin@chromium.org changed reviewers:
+ mstarzinger@chromium.org

[Jarin, 2017-06-19 11:52:32]

Could you take a look, please?

I am especially interested in your opinion on what to do with the
LoweringResult: 

- do you think all the js-type-hint-lowering methods use LoweringResult?

- I am not really happy about the structuring of work between
TryBuildSimplifiedLoadNamed and VisitLdaNamedProperty each do a bit of the
re-wiring work, but I kept it this way to be consistent with other early
lowerings. How would you feel about shifting the ApplyEarlyReduction work to
VisitLdaNamedProperty>

[Jarin, 2017-06-19 11:52:37]

The CQ bit was checked by jarin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-06-19 11:52:39]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-19 12:17:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-19 12:17:15]

Dry run: This issue passed the CQ dry run.