A number of known failures are marked. To support test262's
new tests which simulate multiple script tags, this patch
calls out to the d8 realm API from the harness adaptation code.

Review-Url: https://codereview.chromium.org/2290023002
Cr-Commit-Position: refs/heads/master@{#39099}

New incoming test262 tests check what happens on detached ("neutered")
ArrayBuffers. This patch makes the test262 infrastructure define
detaching an ArrayBuffer in terms of %ArrayBufferNeuter, passing the
--allow-natives-syntax flag, when it is needed.

BUG=v8:4193
LOG=N
R=adamk,machenbach

Review URL: https://codereview.chromium.org/1897203003

Cr-Commit-Position: refs/heads/master@{#35676}

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1668863002

Cr-Commit-Position: refs/heads/master@{#33775}

Based on vogelheim's CL at https://codereview.chromium.org/1657783002/

BUG=chromium:582626, v8:2700
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, vogelheim@chromium.org

Review URL: https://codereview.chromium.org/1656993002

Cr-Commit-Position: refs/heads/master@{#33651}

Previously, String.prototype.normalize constructed its ICU input
string as a null-terminated string. This creates a bug for strings
which contain a null byte, which is allowed in ECMAScript. This
patch constructs the ICU string based on its length so that the
entire string is normalized.

R=jshin@chromium.org
BUG=v8:4654
LOG=Y

Review URL: https://codereview.chromium.org/1645223003

Cr-Commit-Position: refs/heads/master@{#33614}

BUG=572409
LOG=n

Review URL: https://codereview.chromium.org/1555023002

Cr-Commit-Position: refs/heads/master@{#33078}