[wasm] Fix linkage for PPC.

[wasm] Fix linkage for PPC.

Floating point param and return registers should be within the
compiler's allocatable set.

TEST=cctest/test-run-wasm-js/Run_Float64Add_jswrapped
R=titzer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/edff6e91e9873de91db047499857fdb9f96b2168
Cr-Commit-Position: refs/heads/master@{#34194}

[JoranSiu, 2016-02-19 22:21:48]

On 2016/02/19 22:19:21, MTBrandyberry wrote:

lgtm

[titzer, 2016-02-21 09:05:11]

lgtm

[MTBrandyberry, 2016-02-22 14:55:49]

The CQ bit was checked by mbrandy@us.ibm.com

[commit-bot: I haz the power, 2016-02-22 14:55:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1714223002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1714223002/1

[commit-bot: I haz the power, 2016-02-22 15:21:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-22 15:21:42]

Description was changed from

==========
[wasm] Fix linkage for PPC.

Floating point param and return registers should be within the
compiler's allocatable set.

TEST=cctest/test-run-wasm-js/Run_Float64Add_jswrapped
R=titzer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=
==========

to

==========
[wasm] Fix linkage for PPC.

Floating point param and return registers should be within the
compiler's allocatable set.

TEST=cctest/test-run-wasm-js/Run_Float64Add_jswrapped
R=titzer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/edff6e91e9873de91db047499857fdb9f96b2168
Cr-Commit-Position: refs/heads/master@{#34194}
==========

[commit-bot: I haz the power, 2016-02-22 15:21:43]

Patchset 1 (id:??) landed as
https://crrev.com/edff6e91e9873de91db047499857fdb9f96b2168
Cr-Commit-Position: refs/heads/master@{#34194}