When an octal escape sequence is in a string in strict mode:
- Octal literals are not allowed in strict mode.
+ Octal escape sequences are not allowed in strict mode.

When an octal escape sequence is in a template string:
- Octal literals are not allowed in template strings.
+ Octal escape sequences are not allowed in template strings.

BUG=v8:4973
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2551633002
Cr-Commit-Position: refs/heads/master@{#41560}