Don't modify the PWD in gyp_v8

When running gyp in parallel mode (soon the default), we need to be able
to find the script by looking at the path relative to the PWD when the
script was originally invoked.

Instead of changing the directory and relying on relative paths, just
use absolute paths (as gyp_chromium does).

BUG=v8:2973
R=ulan@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/122183004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18439 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Set the gyp DEPTH variable as relative path.

After r18439, it's an absolute variable which confuses gy

LOG=n
R=ulan@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/119293004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18440 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Don't bail out of the cpplint cache is broken.

Instead, try to remove it.

BUG=none
R=ulan@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/117823013

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18441 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert r18435 "... Roll gyp 1685:1806"

TBR=ulan@chromium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/122063003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18442 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Fix loading of global object in LWrapReceiver.

Port r18421 (39719ed)

Original commit message:
Since r16993 the cp register is handled by registers allocator,
and we cannot assume that the cp always contains the context.

BUG=318420
LOG=Y
TEST=test/mjsunit/regress/regress-318420.js
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/123183002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Reland "Allocation site support for monomorphic StringAdds in BinaryOps".

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/106313003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'