PNaCl: Allow translator to produce an unsandboxed, native executable

PNaCl: Allow translator to produce an unsandboxed, native executable

This only works for targeting x86-32 Linux in this initial version.
This allows pnacl-translate to be invoked with "-arch linux-x86-32".
I'll extend this to work on x86-64 and Mac in later changes.

 * Add a minimal IRT implementation that's just enough to run
   hello_world.pexe.  It implements TLS, mmap(), write(), exit(), etc.
   I'll implement more IRT interfaces in a later change.

 * For testing, add a Buildbot step to test this, and add the
   "pnacl_unsandboxed" option to Scons.

This change is a retry of r12218, with a DEPS change to fix checkdeps,
plus a comment.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3699
TEST=run_hello_world_test_irt bitcode=1 pnacl_unsandboxed=1 --mode=nacl_irt_test

Committed: https://src.chromium.org/viewvc/native_client?view=rev&revision=12234

[Mark Seaborn, 2013-10-08 23:18:59]

Same as before, but with the fix in patch set 2.

[Derek Schuff, 2013-10-08 23:21:14]

lgtm

[eliben, 2013-10-08 23:24:16]

https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_...
File pnacl/support/unsandboxed_irt.c (right):

https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_...
pnacl/support/unsandboxed_irt.c:21: 
A comment in this file explaining what it contains and what it's useful for
would be helpful

[Mark Seaborn, 2013-10-10 23:55:48]

https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_...
File pnacl/support/unsandboxed_irt.c (right):

https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_...
pnacl/support/unsandboxed_irt.c:21: 
On 2013/10/08 23:24:16, eliben wrote:
> A comment in this file explaining what it contains and what it's useful for
> would be helpful

I've added a comment.

[eliben, 2013-10-11 00:00:45]

On Thu, Oct 10, 2013 at 4:55 PM, <mseaborn@chromium.org> wrote:

>
> https://codereview.chromium.**org/26607002/diff/3001/pnacl/**
>
support/unsandboxed_irt.c<https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_irt.c>
> File pnacl/support/unsandboxed_irt.**c (right):
>
> https://codereview.chromium.**org/26607002/diff/3001/pnacl/**
>
support/unsandboxed_irt.c#**newcode21<https://codereview.chromium.org/26607002/diff/3001/pnacl/support/unsandboxed_irt.c#newcode21>
> pnacl/support/unsandboxed_irt.**c:21:
> On 2013/10/08 23:24:16, eliben wrote:
>
>> A comment in this file explaining what it contains and what it's
>>
> useful for
>
>> would be helpful
>>
>
> I've added a comment.
>
>
https://codereview.chromium.**org/26607002/<https://codereview.chromium.org/2...


Thanks

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[Mark Seaborn, 2013-10-11 06:52:02]

Committed patchset #4 manually as r12234 (presubmit successful).