MIPS: Add big-endian support for MIPS.

MIPS: Add big-endian support for MIPS.

Important notices:

- The snapshot cannot be created for big-endian target in cross-compilation
  environment on little-endian host using simulator.

- In order to have i18n support working on big-endian target, the icudt46b.dat and
  icudt46b_dat.S files should be generated and upstreamed to ICU repo.

- The mjsunit 'nans' test is endian dependent, it is skipped for mips target.

- The zlib and Mandreel from Octane 2.0 benchmark are endian dependent due to
  use of typed arrays.

TEST=
BUG=

[Paul Lind, 2014-04-15 00:53:28]

The mips parts LGTM. PTAL at the rest...

[Jakob Kummerow, 2014-04-15 08:11:20]

Looks good, just a few nits and a question.

https://codereview.chromium.org/228943009/diff/1/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/228943009/diff/1/src/objects.h#newcode1959
src/objects.h:1959: #if __BYTE_ORDER == __LITTLE_ENDIAN
Any reason this doesn't use V8_TARGET_LITTLE_ENDIAN?

https://codereview.chromium.org/228943009/diff/1/test/mjsunit/mjsunit.status
File test/mjsunit/mjsunit.status (right):

https://codereview.chromium.org/228943009/diff/1/test/mjsunit/mjsunit.status#...
test/mjsunit/mjsunit.status:344: }],  # 'arch == mipsel'
nit: update this comment please

https://codereview.chromium.org/228943009/diff/1/test/test262/test262.status
File test/test262/test262.status (right):

https://codereview.chromium.org/228943009/diff/1/test/test262/test262.status#...
test/test262/test262.status:115: }],  # 'arch == arm or arch == mipsel or arch
== arm64'
nit: update this comment please

https://codereview.chromium.org/228943009/diff/1/tools/testrunner/local/statu...
File tools/testrunner/local/statusfile.py (right):

https://codereview.chromium.org/228943009/diff/1/tools/testrunner/local/statu...
tools/testrunner/local/statusfile.py:56: "arm", "arm64", "ia32", "mips",
"mipsel", "x64", "nacl_ia32", "nacl_x64",
nit: adjust the line break to keep 80col format

[dusmil, 2014-04-15 15:22:21]

https://codereview.chromium.org/228943009/diff/1/src/objects.h
File src/objects.h (right):

https://codereview.chromium.org/228943009/diff/1/src/objects.h#newcode1959
src/objects.h:1959: #if __BYTE_ORDER == __LITTLE_ENDIAN
On 2014/04/15 08:11:20, Jakob wrote:
> Any reason this doesn't use V8_TARGET_LITTLE_ENDIAN?

It is used to keep consistency because there are other ifdef uses of BYTE_ORDER
in this file. I change all of them to check V8_TARGET_LITTLE_ENDIAN and
V8_TARGET_BIG_ENDIAN now.

https://codereview.chromium.org/228943009/diff/1/src/objects.h#newcode1959
src/objects.h:1959: #if __BYTE_ORDER == __LITTLE_ENDIAN
On 2014/04/15 08:11:20, Jakob wrote:
> Any reason this doesn't use V8_TARGET_LITTLE_ENDIAN?

Done.

https://codereview.chromium.org/228943009/diff/1/test/mjsunit/mjsunit.status
File test/mjsunit/mjsunit.status (right):

https://codereview.chromium.org/228943009/diff/1/test/mjsunit/mjsunit.status#...
test/mjsunit/mjsunit.status:344: }],  # 'arch == mipsel'
On 2014/04/15 08:11:20, Jakob wrote:
> nit: update this comment please

Done.

https://codereview.chromium.org/228943009/diff/1/test/test262/test262.status
File test/test262/test262.status (right):

https://codereview.chromium.org/228943009/diff/1/test/test262/test262.status#...
test/test262/test262.status:115: }],  # 'arch == arm or arch == mipsel or arch
== arm64'
On 2014/04/15 08:11:20, Jakob wrote:
> nit: update this comment please

Done.

https://codereview.chromium.org/228943009/diff/1/tools/testrunner/local/statu...
File tools/testrunner/local/statusfile.py (right):

https://codereview.chromium.org/228943009/diff/1/tools/testrunner/local/statu...
tools/testrunner/local/statusfile.py:56: "arm", "arm64", "ia32", "mips",
"mipsel", "x64", "nacl_ia32", "nacl_x64",
On 2014/04/15 08:11:20, Jakob wrote:
> nit: adjust the line break to keep 80col format

Done.

[Jakob Kummerow, 2014-04-15 15:29:54]

Platform-independent changes LGTM.

[Paul Lind, 2014-04-15 16:40:29]

Committed as r20778.