[turbofan] Fix properties of IrOpcode::kThrow operator.

[turbofan] Fix properties of IrOpcode::kThrow operator.

This changes the IrOpcode::kThrow operator to have kNoThrow property,
which sounds unintuitive, but holds for our graphs. The operators is
used to indicate exceptional control flow out of the function, but in
itself does not throw, the throwing is done by a runtime call.

R=titzer@chromium.org
TEST=unittests/CommonOperatorTest/CommonSharedOperatorTest.Properties

Committed: https://crrev.com/48c185fe75350954596ae23d0d8e407ecb42ac61
Cr-Commit-Position: refs/heads/master@{#27541}

[titzer, 2015-03-31 13:28:56]

On 2015/03/31 13:19:38, Michael Starzinger wrote:

LGTM

[titzer, 2015-03-31 13:28:58]

On 2015/03/31 13:19:38, Michael Starzinger wrote:

LGTM

[Michael Starzinger, 2015-03-31 13:30:34]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-03-31 13:30:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1046173002/1

[commit-bot: I haz the power, 2015-03-31 13:44:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-31 13:44:13]

Patchset 1 (id:??) landed as
https://crrev.com/48c185fe75350954596ae23d0d8e407ecb42ac61
Cr-Commit-Position: refs/heads/master@{#27541}