Implement code stub for object literal creation.

Implement code stub for object literal creation.

This generates code stubs for cloning of shallow object literal
boilerplates that have no elements and only fast properties. Improves
splay performance because object literals are created frequently.

R=fschneider@chromium.org

Committed: http://code.google.com/p/v8/source/detail?r=10036

[Michael Starzinger, 2011-11-18 14:21:33]

PTAL. So far I only ported the stub to ia32 and x64. The port to ARM will follow
in a separate CL.

[fschneider, 2011-11-21 12:27:03]

lgtm

http://codereview.chromium.org/8598014/diff/1/src/code-stubs.h
File src/code-stubs.h (right):

http://codereview.chromium.org/8598014/diff/1/src/code-stubs.h#newcode390
src/code-stubs.h:390: ASSERT(length_ >= 0);
Maybe use ASSERT_GE / ASSERT_LE instead of ASSERT.

[Michael Starzinger, 2011-11-21 13:28:14]

Added new patch set. Landed.

http://codereview.chromium.org/8598014/diff/1/src/code-stubs.h
File src/code-stubs.h (right):

http://codereview.chromium.org/8598014/diff/1/src/code-stubs.h#newcode390
src/code-stubs.h:390: ASSERT(length_ >= 0);
On 2011/11/21 12:27:03, fschneider wrote:
> Maybe use ASSERT_GE / ASSERT_LE instead of ASSERT.

Done.