Experimental scanner: keeping track of octal numbers octal escapes.

Experimental scanner: keeping track of octal numbers and octal escapes.

The baseline uses a more liberal definition than ECMA, but it's ok, since this
is only used for whining about octal escapes in the strict mode. (So, even
though "\1" is technically not an octal escape inside a string (since it should
be exactly 2 digits), it's still a good idea to whine.

R=dcarney@chromium.org
TBR=dcarney@chromium.org, ulan@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=18110

[dcarney, 2013-11-27 15:25:42]

lgtm

[marja, 2013-11-27 15:28:56]

Committed patchset #1 manually as r18110 (presubmit successful).

[ulan, 2013-11-27 15:28:57]

lgtm