[turbofan] Quickfix for fround built-in lowering.

[turbofan] Quickfix for fround built-in lowering.

We have trouble with Math.fround(MEM[...]).  Since we now properly type
LoadBuffer (it can produce undefined), lowering of fround has stopped
triggering (as it requires Number type).  This CL is a quick fix for this issue
- we simply trigger the lowering for NumberOrUndefined and let representation
selection/truncation analysis deal with this.

Ultimately, we would want to insert some 'simplified' ToNumber conversion
that would be optimized as much as possible during representation
selection.

BUG=chromium:603802
LOG=n
R=bmeurer@chromium.org

Committed: https://crrev.com/71453f1c0f5e402407f6bf5d7c35f52c75cd7eeb
Cr-Commit-Position: refs/heads/master@{#35513}

[Jarin, 2016-04-15 09:31:27]

Could you take a look, please? (Yes, I do feel ashamed.)

[Benedikt Meurer, 2016-04-15 09:32:35]

Closing my eyes and typing LGTM.

[Jarin, 2016-04-15 09:40:24]

The CQ bit was checked by jarin@chromium.org

[commit-bot: I haz the power, 2016-04-15 09:40:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1893483003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1893483003/1

[commit-bot: I haz the power, 2016-04-15 09:51:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-15 09:52:36]

Description was changed from

==========
[turbofan] Quickfix for fround built-in lowering.

We have trouble with Math.fround(MEM[...]).  Since we now properly type
LoadBuffer (it can produce undefined), lowering of fround has stopped
triggering (as it requires Number type).  This CL is a quick fix for this issue
- we simply trigger the lowering for NumberOrUndefined and let representation
selection/truncation analysis deal with this.

Ultimately, we would want to insert some 'simplified' ToNumber conversion
that would be optimized as much as possible during representation
selection.

BUG=chromium:603802
LOG=n
R=bmeurer@chromium.org
==========

to

==========
[turbofan] Quickfix for fround built-in lowering.

We have trouble with Math.fround(MEM[...]).  Since we now properly type
LoadBuffer (it can produce undefined), lowering of fround has stopped
triggering (as it requires Number type).  This CL is a quick fix for this issue
- we simply trigger the lowering for NumberOrUndefined and let representation
selection/truncation analysis deal with this.

Ultimately, we would want to insert some 'simplified' ToNumber conversion
that would be optimized as much as possible during representation
selection.

BUG=chromium:603802
LOG=n
R=bmeurer@chromium.org

Committed: https://crrev.com/71453f1c0f5e402407f6bf5d7c35f52c75cd7eeb
Cr-Commit-Position: refs/heads/master@{#35513}
==========

[commit-bot: I haz the power, 2016-04-15 09:52:37]

Patchset 1 (id:??) landed as
https://crrev.com/71453f1c0f5e402407f6bf5d7c35f52c75cd7eeb
Cr-Commit-Position: refs/heads/master@{#35513}