Bug: v8:8801, v8:8394
Change-Id: I6bb46ecafe1bd94adbf0409f13c9b2e558da0823
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1594558
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61200}

Adding the StringSubstring simplified operator is a precursor to
improve inlining of String.p.{substr,substring,slice}.
This also contains a drive-by renaming to normalize different
spellings of 'Substring'.

Bug: v8:7250, v8:7340
Change-Id: I89e0fbafeab80f5d2f3ef348a5303d32c0abfe0a
Reviewed-on: https://chromium-review.googlesource.com/919084
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51522}

This is a reland of 3ff4b447.

Original version did not handle V8_INTL_SUPPORT.

Original change's description:
> [turbofan] Move String.* functions to JSCallReducer
>
> Bug: v8:7250, v8:7340
> Change-Id: Ibb8d5badf89c66bd9bcb6bb390256ae81d0e899c
> Reviewed-on: https://chromium-review.googlesource.com/913208
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51505}

Bug: v8:7250, v8:7340
Change-Id: Id908cbcfaa9e9cf5459d6d3289e6ec00e387d287
Reviewed-on: https://chromium-review.googlesource.com/934268Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51514}

This reverts commit 3ff4b447.

Reason for revert: Does not handle V8_INTL_SUPPORT correctly

Original change's description:
> [turbofan] Move String.* functions to JSCallReducer
> 
> Bug: v8:7250, v8:7340
> Change-Id: Ibb8d5badf89c66bd9bcb6bb390256ae81d0e899c
> Reviewed-on: https://chromium-review.googlesource.com/913208
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#51505}

TBR=sigurds@chromium.org,bmeurer@chromium.org

Change-Id: I6efb3b758b0fcadc012a90c4175de3c1ebccee95
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7250, v8:7340
Reviewed-on: https://chromium-review.googlesource.com/934267Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51507}

Bug: v8:7250, v8:7340
Change-Id: Ibb8d5badf89c66bd9bcb6bb390256ae81d0e899c
Reviewed-on: https://chromium-review.googlesource.com/913208
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51505}