[interpreter] Unify meaning of register count operands.

[interpreter] Unify meaning of register count operands.

Unifies the meaning of kRegCount8 and kRegCount16 across bytecodes.
Call and CallJSRuntime had a slightly different use of the register
count operand. From this change forth, register count operands are
always based off of the previous register operand.

BUG=v8:4280, v8:4675
LOG=N

Committed: https://crrev.com/3c64400f194938c3fb66e18a42df7709157b379a
Cr-Commit-Position: refs/heads/master@{#33707}

[oth, 2016-02-02 10:43:52]

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

[oth, 2016-02-02 10:43:52]

PTAL, thanks.

[oth, 2016-02-02 16:10:06]

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

[oth, 2016-02-02 16:10:06]

mstarzinger@chromium.org: Please review changes in compiler, thanks.

[oth, 2016-02-02 16:10:25]

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

[commit-bot: I haz the power, 2016-02-02 16:10:43]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1659023002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1659023002/20001

[commit-bot: I haz the power, 2016-02-02 16:50:22]

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

[commit-bot: I haz the power, 2016-02-02 16:50:22]

Dry run: This issue passed the CQ dry run.

[rmcilroy, 2016-02-03 11:45:57]

lgtm, thanks.

[Michael Starzinger, 2016-02-03 13:53:05]

LGTM on "compiler".

[oth, 2016-02-03 14:57:33]

The CQ bit was checked by oth@chromium.org

[oth, 2016-02-03 14:57:33]

The patchset sent to the CQ was uploaded after l-g-t-m from
rmcilroy@chromium.org, mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1659023002/#ps40001
(title: "Rebase")

[commit-bot: I haz the power, 2016-02-03 14:57:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1659023002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1659023002/40001

[commit-bot: I haz the power, 2016-02-03 15:22:21]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-02-03 15:22:56]

Description was changed from

==========
[interpreter] Unify meaning of register count operands.

Unifies the meaning of kRegCount8 and kRegCount16 across bytecodes.
Call and CallJSRuntime had a slightly different use of the register
count operand. From this change forth, register count operands are
always based off of the previous register operand.

BUG=v8:4280,v8:4675
LOG=N
==========

to

==========
[interpreter] Unify meaning of register count operands.

Unifies the meaning of kRegCount8 and kRegCount16 across bytecodes.
Call and CallJSRuntime had a slightly different use of the register
count operand. From this change forth, register count operands are
always based off of the previous register operand.

BUG=v8:4280,v8:4675
LOG=N

Committed: https://crrev.com/3c64400f194938c3fb66e18a42df7709157b379a
Cr-Commit-Position: refs/heads/master@{#33707}
==========

[commit-bot: I haz the power, 2016-02-03 15:22:57]

Patchset 3 (id:??) landed as
https://crrev.com/3c64400f194938c3fb66e18a42df7709157b379a
Cr-Commit-Position: refs/heads/master@{#33707}