Diagnostic code for chromium 284577

Every place where AllocationMemento is initialized with an 
AllocationSite is now checked to be sure a valid Site goes in. 

This is temporary code to diagnose chromium bug 284577.

(This is a second attempt, the first attempt ran into the problem of undefined ordering of function calls in Windows and Mac optimized builds, see the fixes in code-stubs-hydrogen.cc).

BUG=
R=mstarzinger@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=16719

[Michael Starzinger, 2013-09-13 13:47:55]

LGTM.

[mvstanton, 2013-09-13 13:50:25]

Committed patchset #1 manually as r16719 (presubmit successful).