MIPS: Add signal context definitions for use with Android.

MIPS: Add signal context definitions for use with Android.

As with Arm, the kernel defines this stuff, but bionic lib does not.

BUG=
TEST=

Committed: https://code.google.com/p/v8/source/detail?r=10525

[Paul Lind, 2012-01-27 03:39:15]

This is another Android specific change, which I had forgotten to upstream to
you guys.

Can you please also merge this one to the 3.7 branch?

thanks,

paul

[danno, 2012-01-27 08:57:19]

lgtm

[danno, 2012-01-27 11:49:33]

Actually, I take the LGTM back. Our presubmit scripts don't like the use of the
C types unsigned long and int. Please convert these to the platform unspecific
types, e.g. uint32_t.