Enable ASAN for smart allocator

Summary: Route all smart allocator allocations and frees to malloc for ASAN builds

Reviewed By: @edwinsmith

Differential Revision: D1657895

Signature: t1:1657895:1415905951:b356d1944253bc341fe0ac62751e4f8ba6a7d42a
Disable broken test

Summary: It fails on my devserver 100% of the time. php5.5 agrees
with hhvm's output too.

As far as I can see, it only works if you have LC_ALL set, and
set to some value other than "C" (both under PHP5 and under hhvm).

Reviewed By: @alexmalyshev

Differential Revision: D1684338