Revert of [wasm] Update {i32,i64}.const to use signed leb128

Revert of [wasm] Update {i32,i64}.const to use signed leb128 (patchset #3 id:40001 of https://codereview.chromium.org/1765673002/ )

Reason for revert:
[Sheriff] Breaks chromium win compile:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Win/builds/3844/steps/compile/logs/stdio

Original issue's description:
> [wasm] Update {i32,i64}.const to use signed leb128
>
> R=titzer@chromium.org
> R=bradnelson@chromium.org
> LOG=n
>
> Committed: https://crrev.com/4b613a67e0aa4e073946f5f0dd95ee9366c8ca86
> Cr-Commit-Position: refs/heads/master@{#34471}

TBR=bradnelson@chromium.org,titzer@chromium.org,binji@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/ec0f451b648e1e13afb00a3d2ec9e1f2e46107ec
Cr-Commit-Position: refs/heads/master@{#34482}

[Michael Achenbach, 2016-03-04 09:01:34]

Created Revert of [wasm] Update {i32,i64}.const to use signed leb128

[commit-bot: I haz the power, 2016-03-04 09:01:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1760363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1760363003/1

[commit-bot: I haz the power, 2016-03-04 09:02:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1760363003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1760363003/1

[commit-bot: I haz the power, 2016-03-04 09:02:18]

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

[commit-bot: I haz the power, 2016-03-04 09:02:18]

Failed to apply the patch.

[commit-bot: I haz the power, 2016-03-04 09:03:37]

Description was changed from

==========
Revert of [wasm] Update {i32,i64}.const to use signed leb128 (patchset #3
id:40001 of https://codereview.chromium.org/1765673002/ )

Reason for revert:
[Sheriff] Breaks chromium win compile:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Win/builds/384...

Original issue's description:
> [wasm] Update {i32,i64}.const to use signed leb128
> 
> R=titzer@chromium.org
> R=bradnelson@chromium.org
> LOG=n
> 
> Committed: https://crrev.com/4b613a67e0aa4e073946f5f0dd95ee9366c8ca86
> Cr-Commit-Position: refs/heads/master@{#34471}

TBR=bradnelson@chromium.org,titzer@chromium.org,binji@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of [wasm] Update {i32,i64}.const to use signed leb128 (patchset #3
id:40001 of https://codereview.chromium.org/1765673002/ )

Reason for revert:
[Sheriff] Breaks chromium win compile:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Win/builds/384...

Original issue's description:
> [wasm] Update {i32,i64}.const to use signed leb128
>
> R=titzer@chromium.org
> R=bradnelson@chromium.org
> LOG=n
>
> Committed: https://crrev.com/4b613a67e0aa4e073946f5f0dd95ee9366c8ca86
> Cr-Commit-Position: refs/heads/master@{#34471}

TBR=bradnelson@chromium.org,titzer@chromium.org,binji@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/ec0f451b648e1e13afb00a3d2ec9e1f2e46107ec
Cr-Commit-Position: refs/heads/master@{#34482}
==========

[commit-bot: I haz the power, 2016-03-04 09:03:38]

Patchset 1 (id:??) landed as
https://crrev.com/ec0f451b648e1e13afb00a3d2ec9e1f2e46107ec
Cr-Commit-Position: refs/heads/master@{#34482}