[turbofan] Make new.target explicit in JSCallDescriptor.

[turbofan] Make new.target explicit in JSCallDescriptor.

This adds an explicit parameter to the call descriptor having kind
kJSCallFunction representing the new.target value. Note that for now
this parameter is not yet passed in and hence cannot be used yet. Also
contains some refactoring of how parameter index value are calculated,
establishing Linkage as the central point for such index computations.

This is a preparatory CL to allows us passing new.target in a register
instead of via a side-channel through the construct stub frame.

R=bmeurer@chromium.org
BUG=v8:4544
LOG=n

Committed: https://crrev.com/0227857d26df19bce8588923f9be4cd5ef07269c
Cr-Commit-Position: refs/heads/master@{#32112}

[Michael Starzinger, 2015-11-19 12:18:00]

Description was changed from

==========
[turbofan] Make new.target explicit in JSCallDescriptor.

This adds an explicit parameter to the call descritptor for of kind
kJSCallFunction representing the new.target value. Note that for now
this parameter is not yet passed in and hence cannot be used yet. Also
contains some refactoring of how parameter index value are calculated,
establishing Linkage as the central point for such index computations.

R=bmeurer@chromium.org
BUG=v8:4544
LOG=n
==========

to

==========
[turbofan] Make new.target explicit in JSCallDescriptor.

This adds an explicit parameter to the call descriptor having kind
kJSCallFunction representing the new.target value. Note that for now
this parameter is not yet passed in and hence cannot be used yet. Also
contains some refactoring of how parameter index value are calculated,
establishing Linkage as the central point for such index computations.

This is a preparatory CL to allows us passing new.target in a register
instead of via a side-channel through the construct stub frame.

R=bmeurer@chromium.org
BUG=v8:4544
LOG=n
==========

[Michael Starzinger, 2015-11-19 12:18:37]

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

[Michael Starzinger, 2015-11-19 12:18:37]

Benedikt: PTAL.
Orion: FYI.

[Benedikt Meurer, 2015-11-19 12:44:33]

Nice. LGTM.

[Michael Starzinger, 2015-11-19 12:46:08]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-11-19 12:46:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1461973002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1461973002/1

[commit-bot: I haz the power, 2015-11-19 12:47:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 12:48:40]

Patchset 1 (id:??) landed as
https://crrev.com/0227857d26df19bce8588923f9be4cd5ef07269c
Cr-Commit-Position: refs/heads/master@{#32112}