Parser / PreParser: Simplify error message arguments.

Parser / PreParser: Simplify error message arguments.

In some places, we pretended that there can be multiple arguments, though in
practice there was only one. In other places (most importantly, PreParser), we
only handled one argument. (This means that we were not able to produce a
multi-argument error inside a lazy function anyway.)

This CL makes it clear that there is ever only one argument.

R=ulan@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=21324

[marja, 2014-05-07 11:37:55]

ulan, ptal

[ulan, 2014-05-07 14:12:32]

lgtm

https://codereview.chromium.org/273653002/diff/1/src/parser.cc
File src/parser.cc (right):

https://codereview.chromium.org/273653002/diff/1/src/parser.cc#newcode652
src/parser.cc:652: Handle<String> arg,
You can use MaybeHandle here to make it explicit that arg can be null.

[marja, 2014-05-12 13:40:27]

thx for review

https://codereview.chromium.org/273653002/diff/1/src/parser.cc
File src/parser.cc (right):

https://codereview.chromium.org/273653002/diff/1/src/parser.cc#newcode652
src/parser.cc:652: Handle<String> arg,
On 2014/05/07 14:12:32, ulan wrote:
> You can use MaybeHandle here to make it explicit that arg can be null.

Done.

[ulan, 2014-05-12 13:43:59]

lgtm

[marja, 2014-05-15 09:45:05]

Committed patchset #4 manually as r21324 (presubmit successful).