[Interpreter] Fix cctest/test-bytecode-generator/IfConditions.

[Interpreter] Fix cctest/test-bytecode-generator/IfConditions.

Avoid hard-coding expected parameter indices.  These depend on the
frame size which can vary (e.g. if embedded constant pools are
enabled).

R=oth@chromium.org, rmcilroy@chromium.org, michael_dawson@ca.ibm.com
BUG=

Committed: https://crrev.com/1ed17f20574b9bef0f6dfabfe4d53dc0f7c9fee6
Cr-Commit-Position: refs/heads/master@{#31049}

[MTBrandyberry, 2015-09-30 21:14:09]

The CQ bit was checked by mbrandy@us.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2015-09-30 21:14:18]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375373002/1

[commit-bot: I haz the power, 2015-09-30 21:36:09]

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

[commit-bot: I haz the power, 2015-09-30 21:36:10]

Dry run: This issue passed the CQ dry run.

[MTBrandyberry, 2015-09-30 21:52:03]

This is the current cause of the PPC buildbot failure.

[oth, 2015-10-01 08:07:58]

On 2015/09/30 21:52:03, mtbrandyberry wrote:
> This is the current cause of the PPC buildbot failure.

lgtm. Apologies for the breakage and not fixing it proactively.

Not a change that needs to go into this CL, but it might be better if there a
macro for arguments A(x, n) rather than R(helper.kLastParamIndex...) which has
the magic of knowing the number of parameters hidden. 

Thanks!

[MTBrandyberry, 2015-10-01 13:20:06]

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

[commit-bot: I haz the power, 2015-10-01 13:20:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375373002/1

[commit-bot: I haz the power, 2015-10-01 13:22:58]

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

[commit-bot: I haz the power, 2015-10-01 13:22:59]

Try jobs failed on following builders:
  v8_presubmit on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/6273)

[rmcilroy, 2015-10-01 13:30:36]

On 2015/10/01 13:22:59, commit-bot: I haz the power wrote:
> Try jobs failed on following builders:
>   v8_presubmit on tryserver.v8 (JOB_FAILED,
> http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/6273)

lgtm.

[rmcilroy, 2015-10-01 13:30:41]

The CQ bit was checked by rmcilroy@chromium.org

[commit-bot: I haz the power, 2015-10-01 13:30:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375373002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375373002/1

[commit-bot: I haz the power, 2015-10-01 13:33:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-01 13:33:38]

Patchset 1 (id:??) landed as
https://crrev.com/1ed17f20574b9bef0f6dfabfe4d53dc0f7c9fee6
Cr-Commit-Position: refs/heads/master@{#31049}