[noupstream] Instrument for thread suspension.

[noupstream] Instrument for thread suspension.

When given command line flag -finstrument-for-thread-suspension, generate instrumentation calls for function entry and back edges.

Instrumentation call now looks like:
  __nacl_suspend_thread_if_needed ();

BUG=http://code.google.com/p/nativeclient/issues/detail?id=826
TEST=

[khimg, 2010-09-06 16:15:51]

Have you tried to compile tests, spec cpu2000, etc with this?

[Mark Seaborn, 2010-09-06 16:28:11]

Could you create an issue to track this, so that there is somewhere to record
design issues?  e.g. It should be recorded somewhat that this is intended for
garbage collection support, specifically for Mono.

Mark

[khimg, 2010-09-06 17:43:29]

LGTM, except for the BUG...

[eaeltsin, 2010-09-06 20:31:41]

There is a bug created by Brad, added link to it:
  http://code.google.com/p/nativeclient/issues/detail?id=826

On 2010/09/06 16:28:11, Mark Seaborn wrote:
> Could you create an issue to track this, so that there is somewhere to record
> design issues?  e.g. It should be recorded somewhat that this is intended for
> garbage collection support, specifically for Mono.
> 
> Mark

[eaeltsin, 2010-09-06 20:39:01]

Run spec cpu2000 with -finstrument-for-thread-suspension, all passed.

On 2010/09/06 16:15:51, khimg wrote:
> Have you tried to compile tests, spec cpu2000, etc with this?

[pasko-google - do not use, 2010-09-07 10:23:12]

LGTM

given that it's noupstream, that was easy