TickProcessor script reimplemented in JavaScript.

TickProcessor script reimplemented in JavaScript.

This is an effort to reuse profiler data processing code both in
TickProcessor and Dev Tools Profiler. The old Python implementation
will be removed.

The new TickProcessor works almost identical to the previous one.
However, it has some differences:

1. Not very useful "Call profile" section is replaced with a new
   WebKit-like "Bottom up (heavy) profile" which shows the most
   expensive functions together with their callers. I used it
   personally in order to find and remove bottlenecks in the
   tickprocessor script itself, and found it quite helpful.

2. Code entries with duplicate names (they occur for RegExes, stubs
   and sometimes for anonymous Function objects) are now distinguished
   by adding an occurence number inside curly brackets.

3. (Address -> code entry) mapping is more precise in boundary cases.

4. Windows version no more requires specifying .map file location.

5. Works faster.

Committed: http://code.google.com/p/v8/source/detail?r=1802

[Søren Thygesen Gjesse, 2009-04-27 13:29:29]

LGTM

I am looking forward to trying this out!

http://codereview.chromium.org/99054/diff/1/7
File tools/consarray.js (right):

http://codereview.chromium.org/99054/diff/1/7#newcode74
Line 74: ConsArray.prototype.next = function() {
Maybe throw an exception if atEnd.

http://codereview.chromium.org/99054/diff/1001/36
File tools/tickprocessor.js (right):

http://codereview.chromium.org/99054/diff/1001/36#newcode57
Line 57: this.cppEntriesProvider = cppEntriesProvider;
Trailing underscores?

http://codereview.chromium.org/99054/diff/1001/36#newcode295
Line 295: function(name) { return self.isSharedLibrary(name); },
Indent two more.

[Mikhail Naganov, 2009-04-27 13:49:52]

http://codereview.chromium.org/99054/diff/1001/36
File tools/tickprocessor.js (right):

http://codereview.chromium.org/99054/diff/1001/36#newcode57
Line 57: this.cppEntriesProvider = cppEntriesProvider;
On 2009/04/27 13:29:29, Søren Gjesse wrote:
> Trailing underscores?

Done.

http://codereview.chromium.org/99054/diff/1001/36#newcode295
Line 295: function(name) { return self.isSharedLibrary(name); },
On 2009/04/27 13:29:29, Søren Gjesse wrote:
> Indent two more.

Done.