commit 324e0a7adb553c87780f176823e9cb6e0ce9f932
author Clemens Hammacher <clemensh@chromium.org> Thu Sep 28 16:57:55 2017
committer Commit Bot <commit-bot@chromium.org> Thu Sep 28 16:58:15 2017
tree 133c19623a2e43b9787dad03a9aa0f036ea4a56e
parent 6cd7a5a73a889b9a869e57f0b64afc572d0b7fc4

Revert "[turbofan] eagerly prune None types and deadness from the graph"

This reverts commit e1cdda2512d9844e180883902b08ed9b302471c0.

Reason for revert: Fails 'constructor-inlining' on GC-Stress bot: https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/builds/15270

Original change's description:
> [turbofan] eagerly prune None types and deadness from the graph
> 
> In addition to using the {Dead} node to prune dead control nodes and nodes that 
> depend on them, we introduce a {DeadValue} node representing an impossible value 
> that can occur at any position in the graph. The extended {DeadCodeElimination}
> prunes {DeadValue} and its uses, inserting a crashing {Unreachable} node into
> the effect chain when possible. The remaining uses of {DeadValue} are handled
> in {EffectControlLinearizer}, where we always have access to the effect chain.
> In addition to explicitly introduced {DeadValue} nodes, we consider any value use
> of a node with type {None} as dead.
> 
> Bug: chromium:741225
> Change-Id: Icc4b636d1d018c452ba1a2fa7cd3e00e522f1655
> Reviewed-on: https://chromium-review.googlesource.com/641250
> Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48208}

TBR=jarin@chromium.org,tebbi@chromium.org

Change-Id: I9c175d47e2ee4b11a36ed90421202f2354610398
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:741225
Reviewed-on: https://chromium-review.googlesource.com/690080
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48210}