[turbofan] Fix FrameInspector when deoptimizer is disabled.

[turbofan] Fix FrameInspector when deoptimizer is disabled.

This is a workaround to make the debugger happy about TurboFan frames
when the debugger causes frame inspection. Note that this can happen
because the debugger can be activated while there still are optimized
TurboFan activations on the stack.

R=ishell@chromium.org
BUG=chromium:465298
TEST=mjsunit/regress/regress-crbug-465298
LOG=N

Committed: https://crrev.com/96ef78aa0b664f08d906299f16ffc5dc9dded40f
Cr-Commit-Position: refs/heads/master@{#27717}

[Igor Sheludko, 2015-04-09 16:20:21]

lgtm

[Michael Starzinger, 2015-04-09 16:26:11]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-04-09 16:26:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1074793003/1

[commit-bot: I haz the power, 2015-04-09 19:40:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-09 19:41:07]

Patchset 1 (id:??) landed as
https://crrev.com/96ef78aa0b664f08d906299f16ffc5dc9dded40f
Cr-Commit-Position: refs/heads/master@{#27717}