commit c061734f399e0e7bb3a8f7e3a3797dadcc0eaa68
author Benedikt Meurer <bmeurer@chromium.org> Thu Nov 30 03:56:35 2017
committer Commit Bot <commit-bot@chromium.org> Thu Nov 30 04:27:15 2017
tree 595c9e1e3224a68a7ef153fb2774b45a0f8e2532
parent c30472b83e0c8ce92fa12810b173bf0079fb6da5

[turbofan] Introduce dedicated NewConsString operator.

This is in preparation of adding a dedicated StringLength operator that
loads the string length. This way operations on strings don't sit in the
effect chain anymore until the EffectControlLinearizer, which wires them.

The NewConsString semantics could still be better, i.e. it could try to
figure out the proper map instead of going for the CONS_STRING_TYPE
always. But this change is meant to be just about pushing the logic down
to the EffectControlLinearizer, which we didn't have initially when the
ConsString handling was done.

This also allows us to remove the handling of CONS_STRING_TYPE from the
Deoptimizer, since the escape analysis no longer sees cons strings.

Bug: v8:5269, v8:6936, v8:7109, v8:7137
Change-Id: If6c4a6d7cf63a3a3f7a34a920c8e50a94dfa67fa
Reviewed-on: https://chromium-review.googlesource.com/796413
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49729}