[turbofan] Fix CFI failures in BytecodeGraphBuilder unit test.

[turbofan] Fix CFI failures in BytecodeGraphBuilder unit test.

This fixes undefined behavior with the OpParameter helper in some of our
node matchers. There was a constness mismatch of the template parameter.

R=oth@chromium.org,mythria@chromium.org

Committed: https://crrev.com/8a57c81b3a25b58ed6547e624e72f67ec0cb46cf
Cr-Commit-Position: refs/heads/master@{#32087}

[Michael Starzinger, 2015-11-18 13:43:59]

For context, this CL is to fix the following UBSan failures on the waterfall
with one of our FYI builders:

https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20cfi/builds....

[Michael Starzinger, 2015-11-18 13:46:48]

The code review tool is garbling up my link to the waterfall. Here is a shorter
and working link that shouldn't get mangled up:

https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20cfi/builds...

[oth, 2015-11-18 14:00:29]

Thanks Michi, hadn't realized this. lgtm.

[mythria, 2015-11-18 14:02:54]

lgtm

Thanks,

[Michael Starzinger, 2015-11-18 14:14:14]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-11-18 14:14:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1453973004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1453973004/1

[commit-bot: I haz the power, 2015-11-18 14:15:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-18 14:16:18]

Patchset 1 (id:??) landed as
https://crrev.com/8a57c81b3a25b58ed6547e624e72f67ec0cb46cf
Cr-Commit-Position: refs/heads/master@{#32087}