In certain cases, the compiler might try to merge __stack_chk_guard with
another global variable. (Or someone could theoretically define
__stack_chk_guard as an alias.) In that case, make sure we don't crash.
Differential Revision: https://reviews.llvm.org/D45746
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330495 91177308-0d34-0410-b5e6-96231b3b80d8
Eli Friedman