We need to maintain TypeGuard nodes until the EffectControlLinearizer, because they can protect partial operations from floating above a check. In the linked bug, it was a DeadValue node that got scheduled too early.

In LoadElimination and EscapeAnalysis, the inserted TypeGuard nodes might depend on map checks on the effect chain. Thus TypeGuard has to be an effect chain node too.

Bug: chromium:800929
Change-Id: Icdcff96a2273d96b7f8cd6f85511ad62c1cb129a
Reviewed-on: https://chromium-review.googlesource.com/860405Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50661}