Added irt extension support for supplying the nacl_irt_memory interface.

Added irt extension support for supplying the nacl_irt_memory interface.

Memory calls such as mmap and munmap can now be supplied through the
irt extension API to newlib. Unit tests have also been added to test
if the supplied extension is being used properly.

R=mcgrathr@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=3918
TESTS = trybots, scons test "run_irt_ext_libc_test_irt" under newlib

Committed: https://src.chromium.org/viewvc/native_client?view=rev&revision=13682

[Roland McGrath, 2014-08-28 23:27:42]

LGTM

https://codereview.chromium.org/511253005/diff/40001/tests/irt_ext/file_desc.c
File tests/irt_ext/file_desc.c (right):

https://codereview.chromium.org/511253005/diff/40001/tests/irt_ext/file_desc....
tests/irt_ext/file_desc.c:282: size_t size;
Use C99 style rather than predeclaring a local

[David Yen, 2014-08-29 16:43:33]

https://codereview.chromium.org/511253005/diff/40001/tests/irt_ext/file_desc.c
File tests/irt_ext/file_desc.c (right):

https://codereview.chromium.org/511253005/diff/40001/tests/irt_ext/file_desc....
tests/irt_ext/file_desc.c:282: size_t size;
On 2014/08/28 23:27:42, Roland McGrath wrote:
> Use C99 style rather than predeclaring a local

Done.

[David Yen, 2014-08-29 16:48:40]

The CQ bit was checked by dyen@chromium.org

[commit-bot: I haz the power, 2014-08-29 16:49:02]

CQ is trying da patch. Follow status at
 https://nativeclient-status.appspot.com/cq/dyen@chromium.org/511253005/60001

[David Yen, 2014-08-29 21:15:42]

The CQ bit was unchecked by dyen@chromium.org

[David Yen, 2014-08-29 21:15:48]

The CQ bit was checked by dyen@chromium.org

[David Yen, 2014-08-29 21:20:30]

The CQ bit was unchecked by dyen@chromium.org

[David Yen, 2014-08-29 21:21:18]

Committed patchset #4 (id:60001) manually as 13682 (presubmit successful).