Macro assembler functions for pretenure call new.

Utility functions for pretenure call new. These functions aren't yet called in the tree but will be in the next days. AssertUndefinedOrAllocationSite is to be used in several places where AllocationSite feedback is optional.

R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=19998

[mvstanton, 2014-03-17 12:48:41]

Hi Hannes,
This is one of the carved-out pieces of the already-examined pretenure call new
CL we discussed. Thx,
--Michael

[Hannes Payer (out of office), 2014-03-17 12:50:19]

LGTM rubber-stamped

[mvstanton, 2014-03-17 13:55:33]

Committed patchset #1 manually as r19998 (presubmit successful).