s390x: [wasm] Adding r3 to GP return register list

s390x: [wasm] Adding r3 to GP return register list

Taking similar approach as ia32 which also has 1 return register
eax (as per ia32's ABI) but uses edx as return register as well.
This will fix some failures on s390x where a function returns 2
values.

R=titzer@chromium.org, bmeurer@chromium.org

BUG=
LOG=N

Committed: https://crrev.com/91c99de0a10db4d8ffa4cac8a701eef7dab22c44
Cr-Commit-Position: refs/heads/master@{#40439}

[JaideepBajwa, 2016-10-18 23:55:08]

ptal

[titzer, 2016-10-19 05:33:20]

lgtm

[JaideepBajwa, 2016-10-19 13:13:12]

The CQ bit was checked by bjaideep@ca.ibm.com

[commit-bot: I haz the power, 2016-10-19 13:13:17]

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, 2016-10-19 13:48:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:06:41]

Description was changed from

==========
s390x: [wasm] Adding r3 to GP return register list

Taking similar approach as ia32 which also has 1 return register
eax (as per ia32's ABI) but uses edx as return register as well.
This will fix some failures on s390x where a function returns 2
values.

R=titzer@chromium.org, bmeurer@chromium.org

BUG=
LOG=N
==========

to

==========
s390x: [wasm] Adding r3 to GP return register list

Taking similar approach as ia32 which also has 1 return register
eax (as per ia32's ABI) but uses edx as return register as well.
This will fix some failures on s390x where a function returns 2
values.

R=titzer@chromium.org, bmeurer@chromium.org

BUG=
LOG=N

Committed: https://crrev.com/91c99de0a10db4d8ffa4cac8a701eef7dab22c44
Cr-Commit-Position: refs/heads/master@{#40439}
==========

[commit-bot: I haz the power, 2016-11-17 22:06:42]

Patchset 1 (id:??) landed as
https://crrev.com/91c99de0a10db4d8ffa4cac8a701eef7dab22c44
Cr-Commit-Position: refs/heads/master@{#40439}