PPC: [regexp] do not assume short external strings have a minimum size.

PPC: [regexp] do not assume short external strings have a minimum size.

Port 3518e492c0939759ae1a2623bbd606646ee172f1

Original commit message:

    Short external strings do not cache the resource data, and may be used
    for compressible strings. The assumptions about their lengths is
    invalid and may lead to oob reads.

R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4923, chromium:604897
LOG=N

Committed: https://crrev.com/7d8e279a7b11cb3c1cbeb424118a20210f9b8eea
Cr-Commit-Position: refs/heads/master@{#35671}

[JaideepBajwa, 2016-04-20 16:06:49]

PTAL

[MTBrandyberry, 2016-04-20 16:26:59]

lgtm

[JaideepBajwa, 2016-04-20 16:30:44]

The CQ bit was checked by bjaideep@ca.ibm.com

[commit-bot: I haz the power, 2016-04-20 16:30:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1901593005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1901593005/1

[commit-bot: I haz the power, 2016-04-20 16:52:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-22 19:13:36]

Description was changed from

==========
PPC: [regexp] do not assume short external strings have a minimum size.

Port 3518e492c0939759ae1a2623bbd606646ee172f1

Original commit message:

    Short external strings do not cache the resource data, and may be used
    for compressible strings. The assumptions about their lengths is
    invalid and may lead to oob reads.

R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4923,chromium:604897
LOG=N
==========

to

==========
PPC: [regexp] do not assume short external strings have a minimum size.

Port 3518e492c0939759ae1a2623bbd606646ee172f1

Original commit message:

    Short external strings do not cache the resource data, and may be used
    for compressible strings. The assumptions about their lengths is
    invalid and may lead to oob reads.

R=yangguo@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com,
michael_dawson@ca.ibm.com, mbrandy@us.ibm.com

BUG=v8:4923,chromium:604897
LOG=N

Committed: https://crrev.com/7d8e279a7b11cb3c1cbeb424118a20210f9b8eea
Cr-Commit-Position: refs/heads/master@{#35671}
==========

[commit-bot: I haz the power, 2016-04-22 19:13:37]

Patchset 1 (id:??) landed as
https://crrev.com/7d8e279a7b11cb3c1cbeb424118a20210f9b8eea
Cr-Commit-Position: refs/heads/master@{#35671}