Implements context allocation stub for MIPS.

Implements context allocation stub for MIPS.

Also removes uses of Push and Pop macros.

Committed: https://code.google.com/p/dart/source/detail?r=21824

[regis, 2013-04-22 16:03:38]

LGTM

https://codereview.chromium.org/14069019/diff/6001/runtime/vm/stub_code_mips.cc
File runtime/vm/stub_code_mips.cc (right):

https://codereview.chromium.org/14069019/diff/6001/runtime/vm/stub_code_mips....
runtime/vm/stub_code_mips.cc:701: __ BranchGreaterEqual(T3, TMP1, &slow_case);
The use_slow_path flag is used to test as much code as possible in the stub and
force it to take the slow path, which is otherwise not taken very often.
Therefore, the flag test should happen as late as possible. In this case, you
are not testing the read from heap->EndAddress(). It would be better to test
just before the BranchGreaterEqual.

[zra, 2013-04-22 17:38:24]

Thanks!

https://codereview.chromium.org/14069019/diff/6001/runtime/vm/stub_code_mips.cc
File runtime/vm/stub_code_mips.cc (right):

https://codereview.chromium.org/14069019/diff/6001/runtime/vm/stub_code_mips....
runtime/vm/stub_code_mips.cc:701: __ BranchGreaterEqual(T3, TMP1, &slow_case);
On 2013/04/22 16:03:38, regis wrote:
> The use_slow_path flag is used to test as much code as possible in the stub
and
> force it to take the slow path, which is otherwise not taken very often.
> Therefore, the flag test should happen as late as possible. In this case, you
> are not testing the read from heap->EndAddress(). It would be better to test
> just before the BranchGreaterEqual.

Done.

[zra, 2013-04-22 17:39:39]

Committed patchset #3 manually as r21824 (presubmit successful).