Add thread information to the debugger

Add thread information to the debugger.

Each thread running V8 code is assigned an id in thread local storage the first time V8 code is run in it. The thread information returned to the debugger contains the number of threads, the id of each of these threads and which one is the current thread.

Added a threads command to the developer shell debugger for showing information on threads.

Committed: http://code.google.com/p/v8/source/detail?r=1523

[Erik Corry, 2009-03-17 09:44:12]

LGTM

http://codereview.chromium.org/48009/diff/1/2
File src/runtime.cc (right):

http://codereview.chromium.org/48009/diff/1/2#newcode5778
Line 5778: // Check arguments.
Wrong comment

[Søren Thygesen Gjesse, 2009-03-17 09:54:29]

http://codereview.chromium.org/48009/diff/1/2
File src/runtime.cc (right):

http://codereview.chromium.org/48009/diff/1/2#newcode5778
Line 5778: // Check arguments.
On 2009/03/17 09:44:13, Erik Corry wrote:
> Wrong comment

The comment is correct. All debugger runtime calls has the break id as the first
parameter which is checked by Runtime_CheckExecutionState. This is consistent
with all debugger runtime calls.