[debugging] print ranges for consecutive values with %DebugPrint

[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are combined into a single printout with a range.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}

BUG=

Committed: https://crrev.com/ec4165742088043d8fede38db21a281e16682adb
Cr-Commit-Position: refs/heads/master@{#38069}

[Camillo Bruni, 2016-07-26 13:28:32]

Description was changed from

==========
[debugging] print ranges for consecutive values with %DebugPrint

BUG=
==========

to

==========
[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are printed with a range rather than a
gazilion times.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}


BUG=
==========

[Camillo Bruni, 2016-07-26 13:29:13]

Description was changed from

==========
[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are printed with a range rather than a
gazilion times.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}


BUG=
==========

to

==========
[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are combined into a single printout
with a range.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}


BUG=
==========

[Camillo Bruni, 2016-07-26 13:29:24]

cbruni@chromium.org changed reviewers:
+ yangguo@chromium.org

[Camillo Bruni, 2016-07-26 13:29:25]

PTAL

[Yang, 2016-07-26 13:32:30]

On 2016/07/26 13:29:25, Camillo Bruni wrote:
> PTAL

lgtm!

[Yang, 2016-07-26 13:33:43]

https://codereview.chromium.org/2169143003/diff/1/src/objects-printer.cc
File src/objects-printer.cc (right):

https://codereview.chromium.org/2169143003/diff/1/src/objects-printer.cc#newc...
src/objects-printer.cc:331: bool values_are_nan = previous_value !=
previous_value && value != value;
isnan()?

[Yang, 2016-07-26 13:36:34]

https://codereview.chromium.org/2169143003/diff/1/src/objects-printer.cc
File src/objects-printer.cc (right):

https://codereview.chromium.org/2169143003/diff/1/src/objects-printer.cc#newc...
src/objects-printer.cc:345: os << "<the_hole>";
as discussed, this could also just be a non-hole nan.

[Camillo Bruni, 2016-07-26 17:17:32]

The CQ bit was checked by cbruni@chromium.org

[Camillo Bruni, 2016-07-26 17:17:33]

The patchset sent to the CQ was uploaded after l-g-t-m from yangguo@chromium.org
Link to the patchset: https://codereview.chromium.org/2169143003/#ps20001
(title: "fixing the_hole and NaN printing")

[commit-bot: I haz the power, 2016-07-26 17:17:42]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-07-26 17:39:51]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-26 17:43:41]

Description was changed from

==========
[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are combined into a single printout
with a range.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}


BUG=
==========

to

==========
[debugging] print ranges for consecutive values with %DebugPrint

With this CL repeated values in elements are combined into a single printout
with a range.

BEFORE:
- elements = {
  0: <undefined>
  1: <undefined>
  2: <the_hole>
}

AFTER:
 - elements = {
       0-1: <undefined>
         2: <the_hole>
}

BUG=

Committed: https://crrev.com/ec4165742088043d8fede38db21a281e16682adb
Cr-Commit-Position: refs/heads/master@{#38069}
==========

[commit-bot: I haz the power, 2016-07-26 17:43:41]

Patchset 2 (id:??) landed as
https://crrev.com/ec4165742088043d8fede38db21a281e16682adb
Cr-Commit-Position: refs/heads/master@{#38069}

[Camillo Bruni, 2016-07-26 18:53:12]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2181093003/ by cbruni@chromium.org.

The reason for reverting is: breaks android build due to uninitialized variable.
https://build.chromium.org/p/client.v8.ports/builders/V8%20Arm%20-%20debug%20....