Allow smis for singleton types

Allow smis for singleton types

To that end, introduce a generic Box struct.

R=danno@chromium.org
BUG=

Committed: http://code.google.com/p/v8/source/detail?r=14987

[danno, 2013-06-06 15:36:03]

lgtm with a comment

https://codereview.chromium.org/16562003/diff/1/src/types.h
File src/types.h (right):

https://codereview.chromium.org/16562003/diff/1/src/types.h#newcode90
src/types.h:90: typedef v8::internal::Object Value;
As discussed, I think the typedef is overkill here :-)

[rossberg, 2013-06-06 15:38:35]

https://codereview.chromium.org/16562003/diff/1/src/types.h
File src/types.h (right):

https://codereview.chromium.org/16562003/diff/1/src/types.h#newcode90
src/types.h:90: typedef v8::internal::Object Value;
On 2013/06/06 15:36:03, danno wrote:
> As discussed, I think the typedef is overkill here :-)

Removed.

[rossberg, 2013-06-06 15:40:39]

Committed patchset #2 manually as r14987 (presubmit successful).