call __asan_load_cxx_array_cookie when loading array cookie in asan mode.

Summary:
The current implementation of asan cookie is incorrect:
we add nosanitize metadata to the cookie load, but the metadata may be lost
and we will instrument the load from poisoned memory.
This change replaces the load with a call to __asan_load_cxx_array_cookie (r216692)

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D5111

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@216702 91177308-0d34-0410-b5e6-96231b3b80d8