BytecodeList::New() returns a reference to the BytecodeLabel added to the list.
Since ZoneVector can resize, this reference could become invalid. Instead
move to a ZoneLinkedList so the references never move.

Since we were using zone vectors, the old references were still valid, and
they were only mutated to set is_bound_, so only DCHECKs should have been
affected.

Change-Id: I5da850af2596dcd7f56578a6e5badd332350cb5b
Reviewed-on: https://chromium-review.googlesource.com/544941
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46145}

Downside: this adds all kinds of weird includes in the .cc files.

(See design doc linked in the bug.)

BUG=v8:5402

Review-Url: https://codereview.chromium.org/2622503002
Cr-Commit-Position: refs/heads/master@{#42140}

Changes the control flow builder classes to make use of the
BytecodeLabels helper class.

BUG=v8:4280
LOG=n

Review-Url: https://codereview.chromium.org/2254493002
Cr-Commit-Position: refs/heads/master@{#38744}

Adds TestResultScope and uses it to directly jump/fall through to the
correct branch in expressions used as branch conditions.
Should enable nicer TurboFan-graphs for easier control-flow
transformations in the future.

BUG=v8:4280
LOG=n

Review-Url: https://codereview.chromium.org/2242463002
Cr-Commit-Position: refs/heads/master@{#38634}