[asan] Fix for size_t in Asan's new and delete operators on x64 FreeBSD in 32-bit mode, only for FreeBSD <= 9.2; patch by Viktor Kutuzov

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@202124 91177308-0d34-0410-b5e6-96231b3b80d8