MIPS: Remove static initializers in v8.

MIPS: Remove static initializers in v8.

Port r11010 (1daa81bc).

MIPS-specific changes:
-register codes and registers are defined using a macro to avoid redundancy
-renamed s8_fp to fp, removed the "fp" alias
-removed kSavedValueRegister (found by check-static-initializers.sh)

Original commit message:

Landing for pliard@chromium.org: Remove static initializers in v8.

This change includes two CLs by pliard@chromium.org:

1. http://codereview.chromium.org/9447052/ (Add CallOnce() and simple LazyInstance implementation):

Note that this implementation of LazyInstance does not handle global destructors (i.e. the lazy instances a

This CL was initially reviewed on codereview.appspot.com:
http://codereview.appspot.com/5687064/

2.  http://codereview.chromium.org/9455088/ (Remove static initializers in v8):
This CL depends on CL 9447052 (adding CallOnce and LazyInstance).
It is based on a patch sent by Digit.

With this patch applied, we have only one static initializer left (in atomicops_internals_x86_gcc.cc). This

This CL also modifies the presubmit script to check the number of static initializers.

BUG=
TEST=

Committed: https://code.google.com/p/v8/source/detail?r=11241

[fschneider, 2012-03-20 10:59:48]

lgtm

[fschneider, 2012-03-27 11:19:41]

On 2012/03/20 10:59:48, fschneider wrote:
> lgtm

We reverted the corresponding change on the trunk branch because of a
performance regression. I'll wait with landing this until this is resolved,
since it may involve some changes to this CL as well.

[kalmard, 2012-03-31 11:22:49]

rebased on r11201

[kalmard, 2012-04-05 08:40:25]

rebased on r11230